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I read this article from msn health that I think will interest our members here:

Some dieters may be more likely than others to regain any excess pounds they've lost, depending on their particular hormonal makeup, new Spanish research cautions.

A certain combination of appetite hormones leptin and ghrelin appears to predispose some people to weight gain following a diet, the researchers found.

The connection between appetite hormones such as ghrelin and leptin and long-range weight-loss complications stems from work with 104 obese and overweight men and women, all of whom embarked on an eight-week, low-calorie diet.

Before dieting, during the diet, and about four months post-diet, study author Ana Crujeiras and her colleagues measured each participant's body weight and fasting plasma levels of ghrelin, leptin and insulin.

The bottom-line: Those with higher leptin and lower ghrelin levels before dieting were more likely to reacquire the lost weight after the diet ended. lep·tin: A protein produced by fatty tissue and believed to regulate fat storage in the body

ghrel·in: An enzyme produced by stomach lining cells that stimulates appetite