Ben Greenfield joins to answer your questions on the difference between Vitamin D2 and Vitamin D3, and which should we take; are there positives or negatives to having a gel vs. a Coke during a long training ride; recipe ideas for coconut milk, turmeric and cayenne pepper; the best calories for a long run (or do you really even need anything!); and why cutting back on caffeine is a good idea.
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Studies of nutritional status must take into account the state of the body before and after experiments, as well as the chemical composition of the whole diet and of all material excreted and eliminated from the body. Thanks.