People often wonder how safe it is to eat green beans. The answer is that green beans are fine in small amounts, but eating a lot of raw green beans may cause issues.
Green beans contain lectins that can cause nausea, diarrhea, vomiting, and bloating and can interfere with digestion and nutrient absorption.
Cooking green beans has many benefits. It can inactivate lectins while increasing antioxidants. Cooking also has the benefit of protecting against heart disease and lowering the risk of some cancers.
So, chomping on a few raw green beans is fine, but cooking them is the healthiest way to eat them.