These days, nearly everyone is looking to improve their lifestyle. Whether your goal is to lose weight or to improve on your fitness some other way, the fact of that matter is that millions of Americans are working hard to earn a better body. Unfortunately, there is one simple thing that is impeding nearly every single fitness enthusiast’s progress. What is it? The answer may astound you. The #1 cause of a slow metabolism is dieting – especially “crash dieting.”
This type of dieting involved adopting an extreme life change in regards to caloric intake over a very short period of time. Often, people begin a lifestyle change with a large amount of enthusiasm, so it is tempting to make a dramatic shift. However, extreme dieting can have very negative consequences.
This might seem somewhat counterintuitive to most people, but the science does not lie. Both crash dieting and chronic dieting inevitably demolish your metabolic rate, a fact that has been illustrated in a number of studies published by Metabolism, a prestigious research journal.
A research team at Rockefeller University led by the widely-respected expert, Dr. Rudolph Leibel, compared the metabolisms of people who lost weight through extended periods of chronic dieting and/or “crash dieting” to those who had maintained a normal weight. They found that the metabolisms of those who lost weight were as much as 25% lower than those who had not gained or lost a meaningful amount of weight in the past. In fact, the dieter group had so severely altered their metabolisms that their metabolic weights were slower than normal-weight individuals as much as two-thirds their size.
Similarly, a study by Dr. Campbell at the University of Vienna also showed significantly decreased levels of metabolic, fat-burning hormones after “crash dieting.” the participants in this study displayed thyroid levels that had dropped by a whopping 38% after only 2 weeks of consuming an extremely low-calorie diet. A different study by Dr. Gloria Dubuc and the nutrition research team at the University of California-Davis revealed a 50% decrease in the body’s primary metabolic hormone, leptin, after only a week of a following a severely reduced-calorie diet.
Obviously, extreme dieting in any form can have serious consequences to your body composition. As such, every fitness enthusiast needs to be wary when altering their lifestyle. Irresponsible dieting may very well end up doing more damage than good in the long run.