Also in contrast to WT mice, the amount of lean mass significantly increased in cav‐1 KO mice on both HF and MO diets (LF 21.8 ± 0.4 g, HF 27.5 ± 0.5 g*, MO 26.0 ± 0.9 g*, *P < 0.05 vs. LF). Here, CAV1 is linked to hydrops fetalis.