GLOSSARY

Food Motivation drives food seeking and intake.

For practical use, record meal and training timing, sleep and hunger alongside actual intake and performance trends. When a marker changes, first examine measurement conditions and plausible explanations; food decisions should support adequate supply, tolerance and recovery rather than ending the assessment at one molecular signal or assuming a concentration change automatically establishes a useful intervention.

Eating responds to biological needs and to taste, availability, habit, emotion and reward. Craving a particular food is not a deficiency test for that food's nutrients. Hedonic and homeostatic influences can coexist rather than forming separate behaviors. In sport, restrictive eating, poor sleep or long meal gaps may also affect desire. Assessment should avoid moral labels and consider actual intake patterns rather than assigning every craving to one hormone.

Appetite is desire to eat, distinct from hunger, gastric fullness and actual energy requirements. Satiety concerns suppression between meals, whereas satiation helps end the current meal. A person can feel full while still under-fueled. Recording sensations, actual intake and activity timing together supports planning better than drawing conclusions from one sensation or hormone; subjective scales and food records measure different aspects rather than interchangeable biological quantities.

Hypothalamus and brainstem integrate energy, digestive and environmental information with reward and behavior networks. Nuclei and neuron populations are not simple on–off eating switches. Orexigenic and appetite-reducing pathways interact, and many cellular findings were first studied in animals. A neuropeptide name cannot establish human effect size or an athlete's food requirement; subjective hunger and actual intake must also be assessed alongside physiological mechanisms.

Some exercise, especially hard bouts, can temporarily suppress appetite, but the response varies across people and sessions. Ghrelin, PYY and GLP-1 changes do not have a simple guaranteed relationship with later intake. Lower appetite does not mean lower energy requirements. Athletes can use tolerable foods, smaller portions and workable timing to meet demand and monitor recovery rather than assuming a blunted hunger signal proves that refueling is unnecessary.

Reduced or increased energy intake can change appetite, storage and expenditure signals; these responses are not simply matters of willpower. A short postmeal change differs from adaptations over weeks of weight change. An energy deficit need not immediately produce large weight loss, and surplus does not become exclusively muscle. In sport, the rate of change, training quality, energy availability and health matter more than pursuing a supposed fat-burning hormone.

Circadian rhythms relate to biological clocks, while observed daily patterns also reflect sleep, food and activity. Sleep loss can alter appetite and food choice, but ghrelin and leptin do not change in the same direction in every study. Meal timing should fit training and intake needs. One timing experiment is not a universal rule to omit dinner or fast every athlete; total intake, schedule and individual tolerance still matter.