GLOSSARY

Fat-Soluble Vitamins include A, D, E and K, generally linked to fat handling but differing in stores and risk.

The water- versus fat-soluble classification helps explain absorption, transport and storage, but is not an absolute rule for every member. A, D, E and K are fat-soluble; B vitamins and C are water-soluble. Group membership alone cannot determine individual requirements, supplement risks or elimination rates without considering the particular vitamin.

Fat-soluble vitamins commonly use fat digestion, bile and micelles during absorption, with carrier particles supporting transport. Some meal fat can assist, but an extremely fatty meal is not universally required. With fat malabsorption, simply increasing oral intake may not solve the problem; cause, formulation and body status also require consideration.

Bioavailability concerns the fraction absorbed and available for use, with package content only the starting point. Food matrix, cooking, chemical form and individual conditions can alter it. Natural or active branding alone does not establish universal superiority. Compare actual amounts, appropriate units and evidence for the particular preparation rather than relying on a promotional word.

High intake, increased stores and toxicity are not identical. Risk depends on vitamin, chemical form, amount, duration and underlying conditions. Overlapping supplements, fortified drinks and pre-workout products can supply the same substance repeatedly. Add contributions from all sources rather than evaluating each package's dose separately or assuming that more products improve coverage.

A varied food pattern is more useful than reliance on one food or capsule. Fruit, vegetables, grains, pulses, dairy or fortified alternatives and protein foods make different contributions. Long-term exclusions, very low energy intake, travel and restricted access can create gaps in sports diets; food records help identify which sources are actually missing.

Intake, absorption and body status describe different stages. An apparently adequate recorded intake may coexist with malabsorption, illness or drug interactions. Conversely, one low-intake day does not establish clinical deficiency. Several days of intake, relevant history and an appropriate marker provide more information than one meal or nonspecific tiredness alone.