The relationship between food and body composition is complex and specific, with studies often yielding different results depending on the species, food composition, delivery method, and timing.

“The truth is I think what we know is modest and partly that's because it seems to me to be very specific that is we can do a study and even when it's honestly done and well done and honestly reported and we find that in this species with this delivery of this composition in this way this thing happens and then when you look in a different species or a slightly different food you get different results”