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I went three months without sugar while dieting. That ended at a birthday party, where I had a tiny piece of chocolate cake. The cake immediately made me ill. I started sweating and became dizzy. After that I was convinced that sugar is awful for our bodies.

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Honestly, I've heard similar effects from just about everyone whose avoided any category of food for an extended time and then reintroduced a food that was in the avoided category (whether it's meat, sugar, or any of a number of other things.)

The effect you describe may be more a sign that eating things the body isn't prepared for are disruptive, rather than the harmfulness of the particular avoided food. (Even where the avoided food actually is harmful.)

After five-ish years of mostly sticking to Paleo I have a similar reaction (heart palpitations + general awful feeling) when I eat something like pizza or drink a beer. Not an issue when I eat fries or other simple carb cheats, but it's enough to remind me why I gave up this stuff in the first place.

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