과유불급

過猶不及

Word for word

“too much is the same as not enough”

What it means

Overdoing something is as bad as not doing enough.

When you'd use it

Too much exercise, too much salt, too much advice.

Example

영양제도 과유불급이야. 너무 많이 먹지 마.Vitamins too — too much is as bad as too little.