Question: is lumpy yogurt ok to eat?
Answer: Curdled yogurt is fine to eat if it has curdled from heat. Yogurt might even curdle if it is left to sit in the fridge for an extended period of time. ... This is also perfectly fine to stir back into the yogurt and eat, as long as the yogurt does not have a rancid smell, or has not clumped up like cottage cheese.