If the texture has become lumpy, like cottage cheese, it would bode well for you to simply throw it out. Bad yogurt will also have a watery liquid oozing to the surface. If it does not have a creamy, smooth consistency, as well-set yogurt should have, there is a good chance the yogurt has gone bad.

Is lumpy yogurt OK to eat?

Curdled yogurt is completely fine to eat, as long as it does not have a bad smell or noticeably bad texture. ... It might not look as appealing as you would hope, but if the yogurt was fine before adding it into a meal, it will be fine to eat after.

Why does my yogurt look lumpy?

Culturing yogurt for too long, at too high a temperature, or with an unreliable or compromised starter culture can cause yogurt to separate or turn lumpy. If your yogurt turns lumpy, strain it to remove the whey, then beat the yogurt solids in a bowl with a whisk until it turns smooth.