Amino acid levels during summer and winter in 15 sub-adult free-ranging bears and 39 healthy subjects (28 males) with age 68 years (range 38–80 years).

Median and range, NS; not significant, c winter vs summer. BCAA; branched chain amino acids; EAA; essential amino acids; NEAA; non-essential amino acids. Differences between healthy subjects versus summer levels of 15 sub-adult bears are denoted with ap<0.05, bp<0.001.