Carb Cycling: Eat More on Training Days, Eat Less on Rest Days—A Senior Coach's Practical Breakdown

Opening: The Student Who Ate the Same Amount Every Day

A few years ago, I coached an engineer working in the Hsinchu Science Park — let’s call him A-Hao. He trained for triathlons, rotating his weekend rides between the Beiyi Highway, Fengguizui, and the Yangjin P-Series mountain roads, and spent his weekdays on the trainer at the gym. A-Hao’s biggest problem wasn’t a lack of effort — he trained over a dozen hours a week — but rather “no matter how he trained, he was stuck on a plateau, couldn’t lose weight, and still blew up in the back half of long distances.”

I asked him to show me his weekly food diary. When I spread it out, the problem was clear: he ate almost exactly the same amount of carbohydrates every single day. Whether it was a four-hour long ride or a completely restful recovery day, it was always the same fixed portions: three bowls of rice, one serving of noodles, and a few bananas. He ate too much on rest days and relatively too little on big training days, so his body never had the chance to learn “how to burn fat efficiently,” and he never filled the tank on the days when glycogen was truly needed.

The first adjustment I gave him wasn’t to eat less, nor to cut out sugar, but to “align carbs with training load” — eat more on training days, eat less on rest days. That’s exactly what this article is about: carb cycling, or, to use the more precise term from sports science, carbohydrate periodization.

Let me be upfront: carb cycling is not a magic bullet. Its benefits in research are “conditional and modest in magnitude.” But for someone who “eats the same amount every day,” simply learning to adjust carbs according to training load can often solve half the problem. In this article, I’ll walk through the principles, programming, dosing, common mistakes, and action recommendations at different levels, all from the perspective of coaching an athlete.

Concepts and Scientific Basis: What Carb Cycling Is Really Adjusting

First, Let’s Clarify: Carb Cycling ≠ Low-Carb Diet

This is the misconception I most often have to correct. Many people hear “eat less on rest days” and assume carb cycling means going long-term low-carb, or even keto. Not at all.

• Low-carb / keto diet: Keeps carbs chronically very low (e.g., below 50 grams per day), shifting the body to rely primarily on fat and ketones as fuel. This is a “continuous” state.
• Carb cycling: The “total allocation” of carbohydrates fluctuates with training. On big training days you eat a lot of carbs (possibly more than the average person), and on rest or easy days you reduce them. It’s a “periodic, fluctuating” strategy.

In other words, the spirit of carb cycling is “more when it should be more, less when it should be less,” not “always less.” If you turn it into long-term low-carb, you’re actually doing something else entirely, with different effects and risks.

The Two Roles of Carbs: Fuel and Signal

To understand why cycling matters, you first need to know that carbs play two roles in exercise:

1. Fuel: High-intensity exercise (intervals, race pace, long climbs) relies primarily on glycogen stored in the muscles. When glycogen runs low, high intensity can’t be sustained — this was also one of the direct reasons A-Hao “blew up” in the back half of long distances.
2. Signal: This is the advanced but crucial part. When you do certain training sessions in a low-glycogen state, muscle cells activate a cascade of metabolic signals, including a “cellular energy sensor” called AMPK (AMP-activated protein kinase), which in turn activates PGC-1α. This pathway is linked to mitochondrial biogenesis — in plain terms, it helps the muscles “build more engines that are better at burning fat.”

What carb cycling aims to do is create a window of low glycogen at the right time (to promote fat-metabolism adaptations) while refilling glycogen at the right time (to protect high-intensity quality and race performance). That’s the real logic behind “eat more on training days, eat less on rest days.”

I often use this analogy with my athletes: glycogen is like the fuel tank, and fat-metabolism capacity is like how fuel-efficient the engine is. The traditional “eat the same every day” approach is like keeping the tank permanently full — the engine gets lazy and never learns to save fuel. Carb cycling, by contrast, is deliberately letting the tank run low during low-risk windows, forcing the engine to refine its fuel-saving skills; but on days when you’re truly going to hit the highway (races, intervals), you make sure the tank is full. Both of these can happen at once only through timing that’s “aligned with training load.”

Hormones and Recovery: Why You Can’t Keep the Body Starving Long-Term

There’s another often-overlooked reason carb cycling emphasizes “only eating less on the right days”: chronic energy deficiency disrupts hormones and recovery. When the body stays in a low-carb, low-energy state for extended periods, possible warning signs include — slower recovery after training, elevated morning resting heart rate, poorer sleep quality, changes in the menstrual cycle for women, low mood, and declining training motivation. In sports medicine, this is related to the concept of Relative Energy Deficiency in Sport (RED-S), and the core issue is energy intake chronically failing to keep up with the demands of training and daily life.

This is also why I keep stressing that carb cycling is fluctuation, not reduction: the low-carb window is short, purposeful, and placed in low-risk periods. Once you turn it into daily starvation, what you get isn’t metabolic adaptation — it’s overtraining and endocrine disruption. If you see any of the warning signs above, the first thing to do is add carbs back and return to a normal diet, not push through.

How “Sleep Low / Train Low” Works

There’s a classic model in sports-nutrition research called sleep-low, train-low. Its structure is roughly:

• Evening: Do a high-intensity interval session that depletes glycogen (train-high quality).
• That night: Don’t fully refill carbs after training, keeping glycogen low overnight (sleep low).
• Next morning: Do a low-intensity session in a fasted, low-glycogen state (train low).
• After that, return to normal carbohydrate intake.

This arrangement gives the body a “low-glycogen” window to accumulate metabolic adaptations. In the research, some trials have observed positive results: for example, one study reported the sleep-low strategy improved performance by about 3.2% with higher power output in the latter portion; another three-week intervention with triathletes observed a ~1.1% reduction in body fat and a ~2.9% improvement in 10K running performance.

But — and I need to be very honest here — the evidence is mixed. A systematic review has noted that carbohydrate periodization, compared with traditional “train high,” shows no consistent, clear additional performance advantage, and for that reason, the current position stands of the American College of Sports Medicine (ACSM) and the International Society of Sports Nutrition (ISSN) do not include carb periodization in their formal guidelines. This means: it’s a tool “worth understanding, usable, but not to be mythologized.”

My practical conclusion: carb cycling helps the most for people who “eat randomly or eat the same amount every day,” because it forces you to align diet with training; for advanced athletes who already eat very precisely, the additional benefit is likely small.

Debunking Three Common Myths

Before moving into practice, I want to dismantle three myths I hear most often, so no one goes off in the wrong direction:

• Myth 1: “Carbs are the enemy — the fewer, the better.” Wrong. Carbs are the primary fuel for high-intensity exercise, and for endurance athletes they’re a lifeline. The point of carb cycling is timing and allocation of portions, not treating carbs as an enemy to eliminate.
• Myth 2: “Train low means training on an empty stomach, pushing through.” Wrong. Train low is about creating a metabolic signal under low-intensity, controlled, and subsequently refueled conditions — not running yourself into dizziness. Applying it to high-intensity sessions is misuse.
• Myth 3: “Elite athletes all do this, so I must too.” Not necessarily. Elite athletes have team monitoring and clear season goals; for the average person, forcing the full protocol often has a poor cost-benefit ratio. First ask what your goals and level are, then decide how detailed you need to go.

Practical Methods: How to “Align” Carbs with Training

Step 1: Start with the Carbohydrate Dose per Kilogram

The mainstream sports nutrition recommendation is that daily carbohydrate intake falls within a broad range of 3–12 grams per kilogram of body weight, depending on training load. When I work with athletes, I first use the table below to determine “what kind of day today is”:

Training Day Type	Training Load Reference	Carbohydrate Dose (per kg body weight)	Equivalent for a 70 kg Athlete
Rest / Recovery Day	Almost no movement or walking	3–4 g	~210–280 g
Easy Day	~1 hour low intensity	4–5 g	~280–350 g
Moderate Day	~1 hour moderate intensity	5–7 g	~350–490 g
Heavy / High-Intensity Day	1–3 hours high intensity	6–10 g	~420–700 g
Ultra-Long / Race Day	4+ hours endurance	8–12 g	~560–840 g

This table is the backbone of carbohydrate periodization. “Eat more on training days, eat less on rest days” isn’t based on feeling—it’s about moving up and down within this range according to training load. Note that the values are all ranges, not precise targets—your sex, body composition, metabolism, and climate all affect where you land. In practice, start with the midpoint and fine-tune based on how you feel and how you perform.

Step 2: Put Carbohydrates at the Right Time

The same daily total has a very different effect depending on when you eat it. Two key time windows:

• Before exercise: For sessions longer than 60 minutes, consuming about 1–4 g per kg of carbohydrates 1–4 hours beforehand tops off the tank.
• After exercise: If you want to rapidly replenish glycogen (e.g., you have a second session that day, or tomorrow is another big training day), take in about 1–1.2 g per kg of carbohydrates within 15–30 minutes post-exercise.

Conversely, one of the “eat less” techniques in carbohydrate periodization is deliberately not refueling immediately after certain low-intensity sessions, keeping the low-glycogen signal window open longer (this is the sleep-low logic mentioned earlier). This is the practical, time-based application of “eat less on rest days.”

Step 3: How to Structure a Week—An Example for an Age-Group Triathlete

Take Hao, an age-group triathlete training 5–6 days a week. Here’s roughly how I set up his carbohydrate periodization (estimated for 70 kg):

Day	Training Content	Day Type	Carbohydrate Target	Key Notes
Mon	Complete rest	Rest day	~3 g/kg (210 g)	Increase protein and vegetables, lower carbs
Tue	Evening swim intervals	Moderate day	~6 g/kg (420 g)	Normal fueling before and after training
Wed	Morning easy trainer ride fasted	Easy day / train low	~4 g/kg (280 g)	Delay post-training refueling
Thu	Evening run intervals	Heavy day	~8 g/kg (560 g)	Top up before, refuel quickly after
Fri	Complete rest or walking	Rest day	~3.5 g/kg (245 g)	Store up for the weekend long session
Sat	Long ride (Beiyi / Fengguizui)	Ultra-long day	~9–10 g/kg (630–700 g)	Fuel continuously during the ride; start loading the day before
Sun	Long run or brick session	Heavy day	~7–8 g/kg (490–560 g)	Eat enough the night before and at breakfast that day

Note the design principles:

• Rest days have the lowest carbs, but not zero—vegetables, some whole grains, and fruit remain; you just drastically cut white rice, noodles, and refined sugar.
• The day before the weekend ultra-long session (Friday) is deliberately not depleted—you even store up slightly, to avoid blowing up on the mountain Saturday due to low glycogen.
• The train-low window is placed on Wednesday’s low-intensity day, which is the safest spot—because it’s low intensity, even with lower glycogen you won’t seriously compromise quality.

How to Apply This for Taiwan’s Eat-Out Culture: Common Food Carbohydrate Reference

Most people in Taiwan eat out, and talking about “grams per kilogram” is too abstract. I usually just give athletes a table converting things into bento-shop items:

Common Taiwanese Food	Portion	Approximate Carbohydrates (g)
White rice	1 bowl (~200 g)	~55–60
Yangchun noodles / dry noodles	1 bowl	~55–70
Sweet potato	1 medium	~30–35
Banana	1	~25–30
Toast	1 slice	~13–15
Convenience store onigiri	1	~35–40
Sports drink	500 ml	~30
Unsweetened soy milk	1 cup	~3–5 (negligible)

With this table, “eating less” on rest days becomes concrete: swap two bowls of rice for one, switch sugary drinks for unsweetened ones, and proactively ask the restaurant to give you half the rice. “Eating more” on big training days is also concrete: add rice to meals, fuel with sports drinks and bananas during training, and grab an onigiri afterward. The real challenge of carbohydrate periodization in Taiwan isn’t the theory—it’s recalibrating your eat-out habits.

Step 4: Fit Carbohydrate Periodization into the Larger “Training Cycle” Framework

Many people only think of carbohydrate periodization as “fluctuations within a week,” but a more mature approach is to let it breathe with the entire training season (periodization). The same person should have a different “flavor” of carbohydrate periodization at different training phases:

Training Phase	Goal	Carbohydrate Periodization Style	Practical Focus
Base phase (foundation)	Build aerobic and fat-metabolism capacity	Larger fluctuation range; train-low can be scheduled more often	Lots of low intensity; low-glycogen windows are relatively safe
Build phase (more volume and intensity)	Raise lactate threshold and power	Moderate fluctuation; big training days must be fully fueled	All high-intensity days are train high; protect quality
Peak / pre-race phase	Maintain performance, sharpen form	Smaller fluctuation; lean toward train high	Reduce train-low to avoid hurting peak quality
Taper	Store up, dissipate fatigue	Almost no low-carb days; gradually glycogen-load	Fill the tank before race day; don’t experiment now
Transition / off-season	Recover, relax	Maximum flexibility; no need to be strict	Let body and mind rest; restore dietary freedom

The takeaway from this table: The base phase is your golden window for playing with carbohydrate periodization and accumulating metabolic adaptations; the closer you get to race day, the more you return to “eat enough, protect quality.” Many people do exactly the opposite—they try to “get a bit leaner” with low carbs right before a race and wreck their form. Remember: Pre-race is not a laboratory; pre-race is about filling the tank of an engine you’ve already built.

Case Study 2: A Busy Office-Worker Runner Who Wants to Lose Fat Without Losing Power

Let me give another example, different from Hao. Xiao-Ling is an office worker in her thirties, busy with commuting on weekdays, managing at most three morning runs during the week and one long run on the weekend. Her goal was “healthy fat loss plus finishing a half marathon.” The first thing she asked me was: “Coach, do I need to go low-carb to lose weight?”

What I gave her wasn’t low-carb at all—it was the simplest version of carbohydrate periodization: on the two fully rest days, cut staple foods in half and eliminate all sugary drinks; eat normally on morning-run days; and on the weekend long-run day, I actually had her eat enough, have breakfast before the run, and take in water and a small amount of energy during the run. Three months later, her weight was steadily dropping, she finished the half marathon successfully, and she never experienced the “running out of gas mid-race” she was most afraid of.

Xiao-Ling’s case illustrates one thing: For non-competitive, health-focused people, carbohydrate periodization doesn’t need to be complicated. The key is “don’t skimp on days you should eat, and don’t overeat on days you should cut back.” She never touched advanced techniques like sleep-low; simply separating rest days from training days was enough to hit her goals. This echoes the earlier principle—the complexity of your approach should be proportional to your goals and your level.

Common Mistakes and Fixes

After coaching athletes for years, I’ve seen almost everyone trip on the same pitfalls with carbohydrate periodization. I’ve organized them into a “mistake—consequence—fix” format:

Mistake 1: Turning “Eat Less on Rest Days” into a Long-Term Low-Carb Diet

Consequence: Long-term glycogen depletion causes high-intensity days to fall apart, leaving you weaker the more you train, and can even lead to low mood and poor sleep.

Fix: Remember that carb cycling is about fluctuation, not cutting. On big training days, you really must eat more—possibly even more than your previous daily intake. Low only applies on the days that are supposed to be low.

Mistake 2: Training Low on Big Training Days or Race Days

Consequence: This is the most dangerous mistake. Deliberately keeping glycogen low on days requiring high-intensity output not only hurts performance, but can also cause dizziness and hypothermia from low blood sugar and insufficient energy (especially riding Yangjin or Wuling in winter), raising injury risk.

Fix: The train-low window belongs only on low-intensity days. Before any race, interval session, or long climb, load up on carbs the day before, and keep fueling during and after training.

Mistake 3: Ignoring Taiwan’s Climate Variables

Consequence: Taiwan’s summers are hot and humid. Long exercise means heavy sweating and rapid depletion of blood sugar and electrolytes. If you rigidly “eat less” on long rides in extreme heat, warning signs of heat exhaustion can easily appear.

Fix: Weather is a correction factor for your carb strategy. On long summer training days, push carb and electrolyte intake above the planned numbers—don’t cycle for the sake of cycling. Keep low-carb windows away from the hottest hours whenever possible.

Mistake 4: Completely Ignoring Protein

Consequence: When carbs drop but protein doesn’t rise, total calories fall too fast, leading to muscle loss and slower recovery.

Fix: On rest days when you “eat fewer carbs,” protein and vegetables should be relatively increased to maintain satiety and recovery. For endurance athletes, protein can generally be set at roughly 1.4–2.0 g per kilogram of body weight—especially don’t skimp on rest days.

Mistake 5: Self-Adjusting with Chronic Conditions

Consequence: Carb fluctuation directly affects blood sugar. Diabetics, those with insulin resistance, hypertension, or heart disease who drastically adjust carbs on their own may compromise blood sugar control and medication safety.

Fix: I want to say this with particular seriousness—if you have any of the above chronic conditions, please consult a physician and dietitian first, and make individualized adjustments under professional supervision. Do not copy any online plan (including this article). Taiwan’s National Health Insurance makes it easy to see a doctor; metabolic and nutrition consultation clinics are simple to book—use them.

Mistake 6: Only Watching Body Weight, Ignoring Performance and Feel

Consequence: Many people get excited when weight drops quickly in the first week of carb cycling—but that is mostly glycogen and water changes, not actual fat loss. If you only stare at the scale, it’s easy to misjudge, tighten carbs too much, and damage training quality.

Fix: Diversify your metrics. Body weight is just one item. What matters more: training power/pacing, heart rate at the same intensity, recovery speed, sleep, and mental state. Performance and feel improving together is the right direction.

A Quick Decision Table for “Should I Eat Less?”

Every morning when you’re unsure whether to eat more or less, use this simple table for a fast decision:

Today’s Situation	Recommended Carb Strategy
Complete rest, sitting all day	Eat less (cut staples, increase protein and vegetables)
Only low-intensity easy training	On the lower side; can schedule a train-low window
Intervals, race pace, or long climbs	Eat more; fuel before, during, and after training
Big training day or race tomorrow	Start raising carbs today to build reserves
Extremely hot weather with long outdoor time	Adjust upward; don’t force “eat less”
Poor sleep, elevated heart rate, very fatigued	Restore carbs; prioritize recovery

Actionable Advice for Readers at Different Levels

Carb cycling can be as simple or as complex as you make it. Here are three starting points based on experience level.

Beginners / General Fitness Enthusiasts

You don’t need to calculate grams per kilogram. Just do one thing first:

• On rest days, cut staple foods (rice/noodles) in half and switch sweet drinks to sugar-free; on training days, eat normally or add more rice.

This simple “two-way split” alone captures about 80% of the benefits of carb cycling. Once you’ve been consistent for a month or two and your feel is clear, then consider advancing.

Here’s a ready-to-copy “two-way split weekly table” for beginners (assuming you exercise Tuesday, Thursday, Saturday):

Day	Exercise?	Staple Food Advice	Drinks
Monday	Rest	Rice/noodles in half	Sugar-free
Tuesday	Exercise	Eat normally or add rice	Sports drink OK during exercise
Wednesday	Rest	Rice/noodles in half	Sugar-free
Thursday	Exercise	Eat normally or add rice	Sports drink OK during exercise
Friday	Rest	Rice/noodles in half	Sugar-free
Saturday	Long exercise	Eat enough; fuel before and after	Water and electrolytes during exercise
Sunday	Rest	Rice/noodles in half	Sugar-free

It’s that simple. No weighing, no calorie counting—just follow the rhythm of “eat when you train, pull back when you don’t.” Building the habit is what matters most.

Intermediate Athletes with Regular Training

You can start using a “per-kilogram dosage table” to divide days into three categories:

• Rest days: roughly 3–4 g/kg
• Regular training days: roughly 5–7 g/kg
• Big training days: roughly 8–10 g/kg

Pair this with carb timing around workouts, and use a bento-box food comparison table to make it practical. The key is to run it for a month, log your feel, weight, and training quality, then fine-tune—don’t go all-in the day after you read this. The most common mistake for intermediate athletes is changing too many variables at once—adjusting carbs, the training plan, and supplements simultaneously, so when something goes wrong, you have no idea which one caused it. Change one variable at a time, and you’ll actually understand your body’s feedback.

Advanced / Race-Prep Athletes

Only at this level should you play with the full sleep-low / train-low protocol:

• Schedule 1–2 train-low windows per week, placed on low-intensity days.
• Do a full glycogen supercompensation before races and key sessions.
• Closely monitor sleep, heart rate variability, morning resting heart rate, and training power—if any one clearly deteriorates, return to normal carbs.

Advanced athletes should also remember that honest conclusion: the extra benefit may be small, and overdoing it can hurt quality. Treat it as a fine-tuning tool, not the main course.

Quick Self-Check Table

Before starting, I ask athletes to ask themselves these questions:

Check Question	If You Answer “No”
Am I really eating “more” on big training days?	Get the big days right first, then talk about eating less
Is my train-low only on low-intensity days?	Move it out of high-intensity/race days immediately
Am I getting enough protein and vegetables on rest days?	Add them back—don’t just cut carbs
Do I adjust upward when it’s hot?	Add carbs and electrolytes on long summer training days
Do I have a chronic condition but haven’t asked a doctor?	Stop—see a doctor first

A Common FAQ

Q: Will carb cycling make me lose weight?
A: It may help improve the body’s fat metabolism efficiency and make total calorie intake easier to align with needs, indirectly helping body composition. But the foundation of fat loss remains energy balance and long-term consistency; carb cycling is a supporting tool, not a weight-loss shortcut.

Q: I’m not competing, I just want to exercise for health. Do I need to do it?
A: Not necessarily. For general recreational exercisers, the simple “halve your staple food on rest days” approach mentioned earlier is more than enough. The more complex the protocol, the more suitable it is for people with specific competitive goals.

Q: Will fasted train-low cause muscle loss?
A: As long as it’s done only at low intensity, not for too long, and followed by adequate protein intake, the risk is manageable. Putting fasted train-low into high-intensity or ultra-long sessions is what truly harms the body.

Q: Won’t I feel very hungry and miserable on low-intake days?
A: This is exactly why protein, vegetables, and healthy fats need to be filled in. By shifting satiety from carbs to these foods, rest days don’t have to feel unbearably hungry. In Taiwan, unsweetened soy milk, blanched vegetables, chicken breast, and tofu are all great options to fill you up.

Q: How long until I see results? How do I judge whether it’s working?
A: Metabolic adaptation isn’t a matter of days; it usually takes six to eight weeks of consistent execution to see a clear trend (like in A-Hao’s case). To judge whether it’s working, don’t just stare at body weight—also look at: whether you’re less likely to blow up in the later stages of long rides, whether heart rate at the same pace drops slightly, whether recovery after training speeds up, and your subjective energy and sleep. Only when these indicators all move in the right direction together can it be considered truly effective.

Q: What should women pay attention to with carb cycling?
A: Women are more sensitive to energy deficiency, and long-term low-carb intake may affect menstrual health and bone health. So when female athletes do carb cycling, the low-carb window should be more conservative and shorter, and special attention should be paid to whether the menstrual cycle remains regular. If your period becomes irregular, that’s an important warning sign of insufficient energy—stop the extreme protocol and consult a physician.

Q: Can I combine carb cycling with intermittent fasting?
A: Yes, but be careful about “double stress.” Stacking the two can easily create too large a gap in energy and recovery. If you want to combine them, it’s recommended to schedule fasting on low-intensity or rest days, ensure energy and carbs are fully consumed on big training days, and closely monitor recovery markers. Beginners are advised not to adopt two strategies at once.

Q: Do I need to buy expensive energy gels or supplements?
A: Most amateurs can complete carb cycling with everyday foods—white rice, sweet potatoes, bananas, onigiri, and sports drinks are all more than sufficient. Energy gels exist mainly for “eating while moving, easy to carry, easy to absorb” during long races; daily training doesn’t need to rely on them. First align your daily diet with your training, then consider whether you need supplements.

Conclusion: Teach Your Diet to “Listen to Your Training”

Back to A-Hao. After we changed his diet to carb cycling, within about six to eight weeks, his tendency to blow up in the later stages of long rides improved significantly, and his weight also started to shift—not because he ate less, but because he ate the right amount on the right days. He later told me: “The problem wasn’t that I ate too much; it was that I ate the same amount every day.”

That statement is almost the perfect footnote for carb cycling. Its core isn’t asceticism, isn’t cutting sugar—it’s making your diet learn to listen to your training: generous when it should be, restrained when it should be. It has a scientific basis and practical value, but it’s not a myth either—the evidence is mixed and mainstream guidelines haven’t formally adopted it, so treat it as a smart tool, not a belief.

Start with the simplest “eat more on training days, eat less on rest days,” then track, observe, and fine-tune. You’ll find that simply aligning carbs with training is enough to help many people break through a plateau they’ve been stuck on for a long time. Whether you’re an office worker aiming to finish your first half marathon or a seasoned cyclist wanting to go a bit faster, the principle is the same: Don’t skimp on the days you should eat, and don’t overeat on the days you should cut back. That sentence deserves to be taped to your fridge.

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This article is educational content and does not replace individual diagnosis or treatment advice from a physician, physical therapist, or nutritionist. If you have diabetes, high blood pressure, heart disease, or other chronic conditions, or are taking medication, please consult a qualified medical professional for an individualized assessment before making any dietary changes.

References

• Periodization of Carbohydrate Intake: Short-Term Effect on Performance (PMC): https://pmc.ncbi.nlm.nih.gov/articles/PMC5188410/
• Acute and sustained effects of a periodized carbohydrate intake using the sleep-low model in endurance-trained males (PubMed): https://pubmed.ncbi.nlm.nih.gov/31430404/
• Sports Performance Bulletin — Carbohydrate feeding: sleeping low for superior endurance: https://www.sportsperformancebulletin.com/injuries-health/endurance-health--lifestyle/carbohydrate-feeding-sleeping-low-for-superior-endurance
• Dietary Carbohydrate And The Endurance Athlete: Contemporary Perspectives (Gatorade Sports Science Institute): https://www.gssiweb.org/sports-science-exchange/article/dietary-carbohydrate-and-the-endurance-athlete-contemporary-perspectives

Related Reading

• Carbohydrate Periodization: Eat More When You Train More, Eat Less When You Train Less
• The Complete Guide to Carbohydrate Periodization: Aligning Carbs with Training Demands, Benefits, Scheduling, and Red Lines You Must Never Cross
• Carb Periodization: The Metabolic Dual-Training Strategy of Low-Carb Training and High-Carb Racing
• Carbohydrate Periodization: Dietary Differences Between Training Days and Rest Days