Eating soy in place of meat will probably protect your heart.
Early research suggested that soy could help lower levels of bad cholesterol. But more recent findings have shown that might not be the case, and in 2008, the American Heart Association said that there wasn’t enough evidence to say for sure that soy lowered the risk of heart disease.
Still, it’s safe to assume that soy has some benefits going for it. In general, replacing animal foods with plant foods like soy lowers saturated fat intake and ups fiber intake, both of which are help your heart. In other words, swapping that steak out for tofu or tempeh is a heart-smart move. But having steak followed by a bowl of soy ice cream for dessert probably won’t be as helpful.
You should pay more attention to your soy intake if you have thyroid issues.
Soy foods don’t affect thyroid function in people with healthy thyroids, found a Loma Linda University review of 14 studies. But if you have an underactive thyroid, you might want to watch how much soy you eat. Soy foods have been shown to interfere with the body’s absorption of thyroid medication — but only if you overdo it, suggests a 2016 Nutrients review. The evidence is still far from conclusive, but experts still advise to wait at least four hours after consuming soy to take your thyroid medicine.
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https://www.goodhousekeeping.com/health/diet-nutrition/a20707020/is-soy-good-or-bad-for-you/