Fewer than 300 people in the study had gastric bypass surgery, a more dramatic technique in which the surgeon creates a golf-ball-shaped pouch to curb food intake.

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The birds' energy budgets operate on thin margins of food intake against exhaustive expenditure in long-distance flight.

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"At first, it was really yo-yo, especially with my food intake, " she said.

CNN: March 16, 2012 -- Updated 1113 GMT (1913 HKT)

Yanagimachi said he doesn't know why the mice gained weight, since they have the same food intake and same amount of exercise as the non-cloned mice.

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Two-thirds of his total intake came from junk food.

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Now another product is arriving that promises to do basically the same thing -- namely, track your activity, sleep patterns and food intake using a wearable gadget and mobile app.

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In the new study, published this week in the "Archives of Internal Medicine, " 248 menopausal women were randomly assigned to receive a placebo pill or 200 milligrams of soy isoflavone supplements per day -- a dose "equivalent to approximately twice the highest intake through food sources in typical Asian diets, " Levis says.

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The endpoints were spontaneous food intake, energy expenditure, stress markers, appetite sensations, and profiles of appetite-related hormones.

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Living in a zero-gravity environment poses risk of nutrient deficiency and bone loss, so keeping close tabs on food intake in space is crucial.

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