Medical studies show remarkable results even small changes in glutathione levels significantly impact your immune cells
Detoxification Support - The liver uses glutathione to bind to and remove toxins, heavy metals, and other harmful compounds from the body, a process athletes benefit from when expelling exercise-induced metabolic waste products
If you're talking about blood sugar and fullness signals and all that, it makes sense that you're doing it with meals, although I could see why people might think doing it between meals could have its own positive effect of potentially reducing your hunger signals, for example
To compensate for this sudden loss of blood pressure, the autonomic nervous system triggers severe tachycardia (a rapid heart rate), manifesting as Postural Orthostatic Tachycardia Syndrome (POTS) and other forms of dysautonomia
Rapid weight loss in general regardless of the method can increase the risk of losing muscle and reducing bone density if nutrition intake and resistance exercise are not prioritised