Aurametrix

Food cravings - a physiological need for food, the consequence of food deprivation or timing of external clocks, could be also caused by triggers of learned behavior. Emotional hunger is usually triggered by images of food or emotions and is associated with specific food cravings. If we think our last meal was large and fulfilling, even the false knowledge could keep us fuller longer. Real hunger is more physiological, and appetite is more psychological. Symptoms of food deprivation can start 3-5 hours after eating and build up, progressing from feeling extremely ravenous to experiencing discomfort and pains in the stomach, weakness, and dizziness. 12-16 hours of fasting marks the beginning of noticeable decline in attention, memory, problem solving abilities. Eventually it affects all mental functions as the brain is continually deprived of necessary nutrients. Severe food deprivation leads to vivid hallucinations, confusion, vertigo, and eventually cardiac arrest.
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See also   Comfort level   Sugar cravings   Salt cravings   Craving acidic foods   Fat cravings   Appetite gain