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First, I dispute that good-tasting foods all make you feel bad shortly afterwards. Just as one example, sugary foods make you release all kinds of happy chemicals as you eat it, and that high alone lasts for a while.

Second, simply eating any food AT ALL that keeps you feeling good all day probably increases your risk of cancer. Calorie restriction looks like it does increase our longevity in part due to a decreased risk of cancer.

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Sugary foods cause a crash after consuming them. So yes, there is a negative fall associated with it.

The thing with calorie restriction is if you eat all good foods that make you feel good, likely your "calorie restriction" situation occurs anyways. If you have enough of the good-feeling foods to not be in a state where calorie restriction is actually happening, you begin to feel bad (full/bloated). And thus, fulfill the scenario where "feeling bad" actually is again bad for your long-term health.

The two of you seem to be using different definitions of "shortly afterward". Two seconds after chocolate cake you feel better, two hours after chocolate cake you'll probably feel worse. Sugar affects different people in different ways, though.

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