It is plausibly that feet could shrink while losing weight. The reason for this is that when we lose fat, our bodies release water and toxins stored in our adipose tissue. This release of water and toxins can lead to dehydration, which can cause our bodies to lose electrolytes (sodium, potassium, magnesium, etc.). electrolyte imbalances can lead to muscle cramping, weakness, and paralysis - including in the foot muscles. As the foot muscles weaken, the bones and joints in the feet can start to collapse in on themselves, leading to a smaller overall footprint.
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