Something you may have done a lot of: Dieting. Particularly in the form of "crash dieting" where calories are restricted for extended perdiods of time.
Both crash dieting and chronic dieting can and will wreak havoc on your metabolic rate, as is clearly demonstrated in numerous studies published in the prestigious research journal Metaoblism.
For example, in a study conducted at Rockefeller University by world-renowned obesity researcher Dr. Rudolph Leibel, the metabolisms of individuals who had lost weight via long-term chronic dieting and/or various "crash dieting" techniques were compared to those of individuals who have typically maintained a normal weight.
As expected, the metabolisms of those in the the "dieter" group were 25% lower than those who had not gained or lost significant weight in the past. Even more, the dieter group had accrued so much damage to their metabolism over the years that their now battered metabolic rates were slower than those of normal-weight indidividuals two-thirds their size!
Other studies show significantly decreased levels of important metabolic, fat-burning hormones with crash dieting, such as theMetabolism study performed by Dr. Campbell at the University of Vienna in which thyroid levels dropped by a whopping 38% after just 2 weeks of consuming a very low calorie diet.
And yet another Metabolism study conducted by Dr. Gloria Dubuc and the nutrition research team at the University of California - Davis, showed a 50% reduction in the body's #1 metabolic hormone after just 7 days of following a severely reduced calorie diet.
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