You’ll have a greatly increased risk of weight gain if you eat at night. This would include getting up late at night to eat a snack. You gain more weight when you eat at the wrong time of day for your specific metabolism. See the latest research article in the journal, Obesity, "Circadian Timing of Food Intake Contributes to Weight Gain."
For more information on how biorhythms affect the individual human body in different ways, see my other Examiner article for more detailed information on biological clocks: "How biorhythms and food balance your inner clocks."
Wise food and chronobiology traditions reveal that what is certain is that the person you are in the morning is different from the one you are at night.
Your blood pressure rises between 8 a.m. and 12 noon, then starts dropping until it’s midnight low. There’s an internal clock governing your hormone levels and your heartbeat, all following different clocks that may bear only a slight relation to your daily cycle.
Individuals respond to this regulation by perodic changes in their growth and behavior patterns. Jet lag is one example of what happens when the internal clock is out of whack.
Morning people have a higher body temperature than the afternoon or evening person. That’s what gives them that early morning burst of energy.
All these inner clocks, your biorhythms, are affected by whether you start the day with specific types of protein or complex carbohydrates. And if you’re eating whole grains, for energy, it’s part of wise food traditions to let the whole grains ferment overnight in a refrigerated jar or pot of filtered water.
Research is currently underway at Chicago’s Northwestern University and at Weinberg College of Arts and Science’s Center for Sleep and Circadian Biology.
How the weight gain occurs is that your body is regulated by biorhythms, also called circadian rhythms. When those rhythms are interrupted, weight gain could occur.
The regulation mechanism for the circadian rhythms is being researched to see what role it plays in weight gain from eating during hours your body normally would be sleeping.
There is also preliminary evidence suggesting that variations in genes supporting the molecular clock (CLOCK and GSK3-b) may influence core features of bipolar disorder, such as age at onset and rate of recurrence. See the article, Serretti A, Benedetti F, Mandelli L, et al. "Genetic dissection of psychopathological symptoms: insomnia in mood disorders and CLOCK gene polymorphism." Am J Med Genet. 2003;121B