What are the differences between an adequate diet balanced diet moderate diet and varied diet?

An adequate diet contains all nutrients necessary for long-term survival. It may not necessarily be optimal or have any variety.

A balanced diet refers to a diet that does not have too much of just one thing. For instance, if you eat nothing but rice, pasta, potatoes, bread, and corn, then that is NOT a balanced diet because it has too many starches and not enough protein, fiber, or fat.

A moderate diet is like a balanced diet. Not extreme in any way: not extremely low fat, not extremely low carb, not extremely high sugar; everything is very moderate. However 'moderate' tends to be a VERY subjective term, because what is moderate for one person may not be moderate for another.

A varied diet simply means you are not eating the same foods every day; the foods that you eat vary, which prevents you from becoming deficient in any nutrient.