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[InquilineKea]

Just wondering. Because I often feel irritable when I eat less.

[erzebet]

Animals on calorie restriction displayed higher levels of physical activity compared to normal intake controls, but activity is not the same thing as irritability...unless you are forced to work with the bureaucracy

Seriously now, hunger can make people irritable and even depressed. You can read more about it in this monumental human experiment @The Great Starvation Experiment: Ancel Keys and the Men Who Starved for Science: Todd Tucker: 9780816651610: Amazon.com: Books
 
Mild calorie restriction on the other hand , especially in people without diabetes who manage their blood sugar levels for hours, shouldn't be associated with irritability. If you are experiencing that, you are taking it too far.