Dietary Survey of Taiwanese Professional Cyclists: Energy Intake and Macronutrient Analysis

Based on peer-reviewed research from international sports science journals, this article provides an in-depth analysis of how “athlete dietary surveys” affect athletic performance, and combines Taiwan’s local cycling and race scenarios to offer actionable training nutrition recommendations.

Understanding what elite athletes actually eat is an important reference for applied sports nutrition. Dietary surveys of professional cyclists reveal the actual distribution of energy and macronutrients.

In Taiwan’s endurance sports community—whether it’s climbing enthusiasts heading west up Wuling, long-distance riders heading east through the Huatung Valley, or participants in Sun Moon Lake circumnavigation, Taroko Marathon, or 226 km Ironman triathlons—the topic of “athlete dietary surveys” matters because it directly determines whether you can maintain your pace in the latter stages of a race, avoid cramping and hitting the wall, and recover effectively between consecutive training days. Many amateur athletes pour all their effort into power training and equipment upgrades while overlooking nutrition—this “free margin for improvement.” In fact, when training volume and equipment are comparable, the quality of nutritional strategy is often the key variable separating finishing from DNF, and personal bests from blow-ups. This article will walk you through the complete context—from cellular molecular mechanisms and randomized controlled trial evidence to dose-response curves and practical application—debunking long-circulated myths so your fueling strategy is truly built on science.

Academic Research Review

Regarding the scientific exploration of “athlete dietary surveys,” top international journals have accumulated rich and rigorous evidence. Below are several representative studies selected for their value in methodological design, sample populations, and strength of conclusions, which together form our current understanding of this topic:

1. Heikura IA et al. (2017, IJSNEM) investigated energy availability and diet in elite endurance athletes.

2. Vogt S et al. (2005, MSSE) analyzed energy intake in Tour de France riders.

3. Sánchez-Benito JL et al. (2009, Nutr Hosp) studied the diet of cyclists.

4. Spronk I et al. (2015, Br J Nutr) explored the relationship between athletes’ nutrition knowledge and diet quality.

Taken together, these studies show that the scientific picture of “athlete dietary surveys” is not a single fixed conclusion, but rather one that is continually revised and deepened as research methods improve. Early studies mostly used laboratory-controlled time trials or exhaustion tests; subsequent research gradually introduced stable isotope tracing, muscle biopsies, functional magnetic resonance imaging (fMRI), and molecular biomarkers, allowing us to move from “observing phenomena” to “explaining mechanisms.” Notably, most high-quality studies employ a randomized crossover design, where each subject serves as both experimental and control, greatly reducing noise from individual differences. However, extrapolation of research conclusions still requires caution: the responses of well-trained subjects in the laboratory may not fully translate to general amateur athletes; nor do the effects of a single acute intervention necessarily equal long-term chronic adaptation. When reading the “effect sizes” and “statistical significance” of these studies, we must also distinguish between “statistically significant” and “practically meaningful”—a 1% improvement might decide medal placement in elite competition, but its significance is relatively limited for recreational riders.

Core Mechanisms

Professional cyclists can expend 6000–8000 kcal on major race days, requiring carbohydrate intake of 8–12 g/kg/day and protein of 1.5–2 g/kg. Research has found that many athletes have inadequate energy intake (especially climbers trying to control body weight) and insufficient race-day carbohydrates, reflecting a gap between knowledge and execution. Periodized nutrition is a modern trend.

To truly understand how “athlete dietary surveys” affect athletic performance, we must return to physiology at the cellular and systemic levels. Athletic performance is the result of multi-system coordination: the cardiovascular system handles oxygen and fuel delivery, muscle cells handle energy conversion and mechanical contraction, the central nervous system regulates motor unit recruitment and perceived fatigue, and the gut and liver form the hub of nutrient absorption and metabolism. The reason these mechanisms translate into measurable performance differences is precisely because they act on one (or more) critical links in this chain. The table below summarizes the key points of action of this topic at different physiological levels, helping you build a complete mechanistic picture:

| Level of Action | Key Mechanisms | Significance for Athletic Performance |

|—|—|—|

| Cellular/Molecular | Affects mitochondrial efficiency, enzyme activity, and signal transduction | Determines the efficiency of energy conversion and the direction of adaptation |

| Muscle Tissue | Regulates substrate utilization, buffering capacity, and contractile function | Affects sustainable power output and the onset of fatigue |

| Systemic Integration | Alters blood flow distribution, thermoregulation, and hormonal environment | Determines stability and safety during prolonged exercise |

| Central Nervous System | Regulates perceived fatigue, drive, and motor unit recruitment | Affects “how hard it feels” and the ability to persevere |

Two dimensions deserve special emphasis: “dose-response” and “temporal dynamics.” The same nutritional intervention, at different doses and different timing, can produce vastly different or even opposite effects—this is precisely why many popular recommendations are one-sided. Only by understanding the mechanisms can we judge “when to use it, how much to use, and when,” rather than blindly following trends.

Looking further, the limiting factors of athletic performance shift dynamically with exercise intensity and duration: in short, high-intensity efforts, the limitation often comes from the phosphagen system and the accumulation of glycolytic byproducts; in multi-hour endurance events, the limitation shifts to a combined effect of glycogen depletion, rising core temperature, fluid and electrolyte imbalance, and central fatigue. The reason “athlete dietary surveys” deserve in-depth exploration is precisely because they can specifically target certain of these limiting factors. This also reminds us that no nutritional strategy can be evaluated in isolation from the “exercise context”—a fueling rhythm suitable for a 40-minute criterium may not apply to a 6-hour climbing epic, and vice versa. The more thoroughly you understand the mechanisms, the more flexibly you can adjust across different race formats, rather than rigidly adhering to a fixed formula. This ability to “adapt to context” is precisely the dividing line between amateur athletes and those who truly understand sports science.

Dose-Response Relationships

In sports nutrition, “the dose determines both the toxicity and the benefit.” Too low a dose fails to reach the physiological threshold and is futile; too high a dose may trigger side effects, gastrointestinal distress, and even interfere with training adaptations. The table below summarizes the dose-response correspondence for “athlete dietary surveys” and serves as the most important quantitative reference for developing a personal fueling plan:

| Dose / Condition | Effect Description |

|—|—|

| Energy Expenditure | 6000–8000 kcal on major race days |

| Carbohydrate 8–12 g/kg | Race-day requirements |

| Protein 1.5–2 g/kg | Muscle maintenance |

| Common Issues | Inadequate energy/carbohydrate intake |

As the table above shows, benefits often follow an “inverted U” or “threshold-plateau” curve: effects increase with dose until the effective threshold is reached, but beyond a certain plateau point, there is no additional benefit, while marginal costs (side effects, gastrointestinal burden, financial expense) rise sharply. This means “finding your own optimal dose” matters far more than “eating as much as possible.” It is recommended to progressively test different doses during training (not on race day), recording subjective feelings, gastrointestinal responses, and power data to build your own dose profile. Remember: the laboratory average is a starting point, not the endpoint; each person’s body weight, metabolic rate, gut tolerance, and genetic background will cause individual shifts in the optimal dose.

Differences Across Population Groups

The benefits of the “Athlete Dietary Survey” are not equal for everyone. Age, sex, training status, body size, and genetic background all significantly modulate the magnitude of individual responses. Applying a one-size-fits-all recommendation while ignoring these differences is one of the most common mistakes in sports nutrition.

| Population Aspect | Response Characteristics | Practical Recommendations |

|—|—|—|

| Beginners vs. Advanced Athletes | Advanced athletes have more mature physiological adaptations; responses are often more stable but with smaller marginal gains | Beginners should start conservatively with low doses to build tolerance first |

| Male vs. Female | Differences in body weight, hormonal cycles, and sweat composition affect dosage and requirements | Females should individualize based on body weight and pay attention to iron and energy availability |

| Young vs. Older | Older individuals often experience reduced absorption efficiency and anabolic resistance | Older individuals may require higher doses or better timing |

| Body Size Differences | Body weight directly affects the absolute amount calculated per mg/kg or g/kg | Always convert to a dose corresponding to individual body weight; avoid copying general rules verbatim |

When interpreting “individual differences,” one must also be wary of a common statistical pitfall: studies mostly report “group average responses,” but beneath the average often lies enormous individual variability. In the same intervention, some may be responders, some non-responders, and some even negative responders. This is why even when a study shows “average effectiveness,” you still need to confirm which category you fall into through your own experimentation. The recommended approach is to conduct personalized A/B testing: across two training sessions with as similar conditions as possible, adopt and then omit the strategy respectively, comparing power, heart rate, and subjective feelings. Repeat several times before drawing conclusions. This empirical spirit of “using yourself as the sample” is the essential path to translating group science into a personal prescription.

Taking the common amateur endurance population in Taiwan as an example, many are masters athletes over 35 years old who train in their spare time. This group simultaneously faces reduced recovery speed, insufficient sleep, and time pressure, so the “return on investment” of nutritional strategies is often higher than for young elites—that is, correct nutritional intervention can yield relatively greater room for improvement. Female athletes, in particular, need to pay close attention to the effects of the menstrual cycle on metabolism and requirements, as well as whether energy availability is sufficient, to avoid falling into the low energy availability (LEA) trap while pursuing leanness. After understanding population differences, you will realize: truly professional nutritional advice is always an individualized prescription that “varies from person to person,” not a one-size-fits-all slogan.

Practical Training Application

Theory must ultimately be implemented in training plans and on the race course. Below is a practical framework for translating the “Athlete Dietary Survey” into concrete training and competition operations:

• Pre-race testing principle: All nutritional strategies must first be rehearsed in training; “never try anything new on race day” is an iron rule. Gastrointestinal tolerance to new fueling products takes time to build.

• Periodization mindset: Align nutritional strategies with the training cycle—the base phase can focus on adaptation-oriented strategies, while the pre-season shifts to performance-oriented fueling optimization.

• Progressive introduction: Start with low doses and low frequency, gradually adjust based on bodily responses, and build a personalized dose and timing profile.

• Data tracking: Combine records from power meters, heart rate, subjective fatigue (RPE), and gastrointestinal comfort to objectively evaluate whether an intervention is truly effective.

• Overall context: Nutrition is one component of training, sleep, recovery, and psychology; no single supplement can compensate for sleep deprivation or flaws in training design.

Using a one-week training schedule as an example, it is recommended to rehearse different fueling scenarios during key midweek high-intensity sessions (such as threshold intervals or hill repeats) and the weekend long ride: high-intensity days focus on rapid energy supply and central nervous system activation, while long-distance days focus on sustained energy supply, gastrointestinal tolerance, and recovery. Through repeated rehearsal, your body can execute the optimal fueling rhythm “automatically” on race day, leaving mental resources for pacing and tactical decisions. Remember, the goal of a nutritional strategy is not to pursue theoretical perfection, but to remain stable and reliable under the fatigue, heat, and pressure of a real race.

The most common mistake many people make when executing a nutrition plan is “being serious only on race day while eating carelessly during regular training.” This is precisely putting the cart before the horse: regular training is the best laboratory for building gut tolerance, testing doses, and cultivating fueling rhythm. If you hope to execute a fueling plan of 80 grams of carbohydrates per hour on race day, you must rehearse it repeatedly in training until your body becomes accustomed to it; if you intend to rely on a certain supplement, you must confirm in training that it is truly effective for you and has no side effects. It is recommended to integrate a nutrition log with your training log, recording fueling content, intake timing, gastrointestinal responses, and performance data for each key session. After weeks to months of accumulation, the value of this personalized database will far exceed that of any generic nutrition guide. Furthermore, do not overlook the often-underestimated aspect of “post-training recovery fueling”—the quality of recovery between consecutive training days often determines whether you can steadily accumulate training volume without injury, and training volume is the most fundamental engine of long-term progress. Treat nutrition as part of training and take it seriously, rather than as an afterthought you scramble for before race day—your improvement curve will be noticeably different.

Local Application in Taiwan

Taiwan’s unique climate, terrain, and race culture add localized considerations to the application of the “Athlete Dietary Survey.” Taiwan’s summer is hot and humid, with apparent temperatures often exceeding 35°C; sweat rates and fluid/electrolyte losses are far higher than in research scenarios from temperate countries. This means that hydration and fueling recommendations from foreign literature often need to be “adjusted upward.” In events like the Westbound Wuling climb, which ascends from sea level to 3,275 meters, the appetite suppression at altitude, low temperatures, and prolonged exercise pose a severe test for energy planning.

Regarding local fueling options, Taiwan’s abundant bananas, sweet potatoes, pineapples, sports drinks, and convenience store ready-to-eat foods can all be incorporated into fueling strategies; the extremely high density of convenience stores also makes mid-ride refueling on long rides relatively easy. It is recommended that Taiwanese cyclists planning classic routes such as Sun Moon Lake, Wuling, Beiyi, Buyan Ting, and Eastbound routes inventory fueling points along the way in advance and strengthen sodium and fluid intake in response to Taiwan’s humid and hot environment. Athletes in the Taroko Marathon, Taipei Marathon, and various local triathlon events should likewise incorporate the aforementioned local climatic factors into their individualized nutrition plans to perform at their best under subtropical conditions.

Debunking Common Myths

Myth: The myth is that “professional athletes should eat as little as possible and be as lean as possible.” In fact, insufficient energy intake triggers RED-S and performance decline; periodized adequate fueling is the trend.

This type of myth spreads widely, often because it “sounds reasonable,” is easily passed along by word of mouth, or is amplified by marketing rhetoric. Yet the value of science lies precisely in testing intuition with rigorous evidence: many seemingly obvious notions fail to hold up under randomized controlled trials. The field of sports nutrition is especially rife with oversimplified “panacea” style promotion, compressing complex dosing, timing, and individual differences into a single slogan. The next time you hear a dogmatic nutritional recommendation, it is worth asking: “What is the level of evidence for this claim? Who is the target population? Are the dose and timing clearly specified?” Cultivating this evidence-based critical thinking is more valuable than memorizing any single conclusion, and it is a key step for amateur athletes moving toward scientific training.

Conclusion

The “Athlete Dietary Survey” is a topic in sports nutrition with both theoretical depth and practical value. From the academic evidence reviewed in this article, it is clear that its benefits are real, but it is by no means an unconditional panacea—the key lies in correct dosing, appropriate timing, individualized adjustments, and synergy with overall training, recovery, and sleep. For endurance sports enthusiasts in Taiwan, while mastering scientific principles, it is equally important to combine local climate, terrain, and race characteristics to transform general principles into a personalized prescription suited to oneself. May every cyclist sweating on Wuling, in the East Rift Valley, or on a round-island journey break through their limits through scientific nutritional strategies and enjoy the pure joy that sport brings. Before you next step onto the race course, remember—your fuel bottle holds not just water and sugar, but an entire validated system of sports science.

Related Reading

• The Application of Personalized Nutrition in Sports: Precision Diets Based on Genomics and Gut Microbiota
• Energy Demands of High-Altitude Cycling in Taiwan: A Quantitative Study of Caloric Expenditure on the Wuling Climb
• The Impact of Long-Term Vegan Diets on Endurance Performance: Analysis of Potential B12 and Iron Deficiencies
• Gastrointestinal Tolerance of Energy-Dense Foods in Ultramarathons: Fueling Research in Trail Running Events