What if the scale doesn't move, but your body quietly trades fat for muscle? A double-blind trial of 44 healthy adults found that 6 weeks of fish oil (about 2.4 g EPA+DHA daily) shifted body composition by roughly half a kilo each way, with body weight unchanged. A drop in salivary cortisol tracked with the changes, though that link is only correlational. Resting metabolic rate didn't budge, and the sample was small. Here's what the numbers really show, and how to use them sensibly.
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