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While those studies are useful, you can't argue with results, even if you have only tested it on yourself, it at least is true for you, even if you don't fully understand the mechanism.

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This seems reasonable, until you consider that there might be other factors at play. Maybe he eats food that is hard to digest or causes a sugar rush and then sugar crash, and simply not riding the sugar roller coaster felt better, but he'd feel the same or even better by eating meals with less simple carbohydrates.

The point of these studies is to remove these other factors and test one thing at a time.

Then you have only proven that not eating results in feeling better than eating exactly what you used to, keeping everything else the same, not that not eating is better than eating independently of what you eat.

Unless he's kept detailed records then he's working only from memory which is much less reliable than people think and apt to find patterns in mere coincidences.

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