The Hidden Cost of Thermogenesis ,But where is that energy coming from when fat stores drop?

If fat is dropping energy is coming from stored body fat simple thermodynamics

Thermogenesis isn’t free you’re burning fuel somewhere

Ideally fat stores Worst case muscle tissue

If protein is low the body will tap muscle to cover the gap

Hormones decide the partitioning not just calories

Thyroid up more burn but also higher energy demand

Fat loss energy release but efficiency isn’t 100%

Glycogen depletion often comes before deeper fat loss

Adaptation slows everything over time metabolic resistance

Brown fat activation sounds great but still needs fuel

The real cost isn’t fat it’s what else the body sacrifices

Sustainable fat loss controlled energy release not extremes