Eat half, or at least less, of what you were previously eating. That way you can stretch the grocery budget
Go to the farmer’s markets before or at closing time that is when they cut good deals.
Say no to soda. Even diet sodas! They aren't cheap. Spend that money on some good produce instead.
Go vegetarian, it will boost your health and not upset your wallet, if done correctly.
Make breakfast cereal at home with simple whole-grain ingredients. Processed cereals are more expensive
Stop buying and eating red meat regularly it is more expensive and associated with diseases.