Why are some old people not allowed to put monosodium glutamate in cooking and think it is unhealthy?

Nowadays, many elderly people do not put monosodium glutamate in cooking, thinking that monosodium glutamate is a chemical product that is harmful to people's health. Actually, this is a misunderstanding. Eating monosodium glutamate in moderation has no effect on people's health.

Nowadays, many elderly people do not put monosodium glutamate in cooking, thinking that monosodium glutamate is a chemical product that is harmful to people's health. Actually, this is a misunderstanding. Eating monosodium glutamate in moderation has no effect on people's health. Nowadays, many elderly people do not put monosodium glutamate in cooking, thinking that monosodium glutamate is a chemical product that is harmful to people's health. Actually, this is a misunderstanding. Eating monosodium glutamate in moderation has no effect on people's health. Nowadays, many elderly people do not put monosodium glutamate in cooking, thinking that monosodium glutamate is a chemical product that is harmful to people's health. Actually, this is a misunderstanding. Eating monosodium glutamate in moderation has no effect on people's health. Nowadays, many elderly people do not put monosodium glutamate in cooking, thinking that monosodium glutamate is a chemical product that is harmful to people's health. Actually, this is a misunderstanding. Eating monosodium glutamate in moderation has no effect on people's health. Nowadays, many elderly people do not put monosodium glutamate in cooking, thinking that monosodium glutamate is a chemical product that is harmful to people's health. Actually, this is a misunderstanding. Eating monosodium glutamate in moderation has no effect on people's health.