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I would add one caveat to this. When the body starts burning fat to survive, it can cause a Herxheimer reaction if someone's diet isn't good, or hasn't been good in the past.


There are a lot of toxins in the modern food supply (most notably called "persistent organic pollutants" in the current scientific literature surrounding this subject), and there's increasing data suggesting we're also exposed via environmental factors. These chemicals don't break down easily, in the environment, or in our body. When we're exposed to those chemicals, our body stores them in our fat cells as a mechanism to protect the body, where those toxins will do the least damage. However, when we burn fat, those toxins get released into the bloodstream, which will cause you to feel worse, even though you're losing weight (i.e. a Herxheimer reaction), which should help you feel better (if you're overweight). This might contribute to people stopping a fast, a diet, or exercise regime to help lose weight, as these toxins make them feel worse in the new habit.


It can take the body a long time to fully rid itself of those toxins. Given how persistent those chemicals are, it's almost impossible to completely avoid them. However, the best step people can take is to eat only organic foods, as most of those toxins are chemicals sprayed on veggies, fruits, and grains.


A short article on the subject:


https://paleoleap.com/do-people-release-toxins-when-they-lose-weight/