Low carb (carbohydrate), high protein diets are the latest dieting craze. However, before you jump on the band wagon, you may want to consider a few things:

1. Low carb (ketogenic) diets deplete the healthy glycogen (the storage form of glucose) stores in your muscles and liver. When you deplete glycogen stores, you also dehydrate, often causing the scale to drop significantly in the first week or two of the diet. This is usually interpreted as fat loss when it’s actually mostly from dehydration and muscle loss. By the way, this is one of the reasons that low carb diets are so popular at the moment - there is a quick initial, but deceptive drop in scale weight.

Glycogenesis (formation of glycogen) occurs in the liver and muscles when adequate quantities of carbohydrates are consumed - very little of this happens on a low carb diet.

Glycogenolysis (breakdown of glycogen) occurs when glycogen is broken down to form glucose for use as fuel.

2. Depletion of muscle glycogen causes you to fatigue easily, and makes exercise and movement uncomfortable. Research indicates that muscle fatigue increases in almost direct proportion to the rate of depletion of muscle glycogen. Bottom line is that you don't feel energetic and you exercise and move less (often without realizing it) which is not good for caloric expenditure and basal metabolic rate (metabolism).

3. Depletion of muscle glycogen leads to muscle atrophy (loss of muscle). This happens because muscle glycogen (broken down to glucose) is the fuel of choice for the muscle during movement. There is always a fuel mix, but without muscle glycogen, the muscle fibers that contract, even at rest to maintain muscle tone, contract less when glycogen is not immediately available in the muscle. Depletion of muscle glycogen also causes you to exercise and move less than normal which leads to muscle loss and the inability to maintain adequate muscle tone.

Also, in the absence of adequate carbohydrate for fuel, the body initially uses protein (muscle) and fat. the initial phase of muscle depletion is rapid, caused by the use of easily accessed muscle protein for direct metabolism or for conversion to glucose (gluconeogenesis) for fuel. Eating excess protein does not prevent this because there is a caloric deficit.

When insulin levels are chronically too low as they may be in very low carb diets, catabolism (breakdown) of muscle protein increases, and protein synthesis stops.

4. Loss of muscle causes a decrease in your basal metabolic rate (metabolism). Metabolism happens in the muscle. Less muscle and muscle tone means a slower metabolism which means fewer calories burned 24 hours-a-day.

5. Your muscles and skin lack tone and are saggy. Saggy muscles don't look good, cause saggy skin, and cause you to lose a healthy, vibrant look (even if you’ve also lost fat).

6. Some proponents of low carb diets recommend avoiding carbohydrates such as bread, pasta, potatoes, carrots, etc. because of they are high on the glycemic index - causing a sharp rise in insulin. Certain carbohydrates have always been, and will always be the bad guys: candy, cookies, baked goods with added sugar, sugared drinks, processed / refined white breads, pastas, and rice, and any foods with added sugar. These are not good for health or weight loss.

Page 1 of 3 :: First | Last :: Prev | 1 2 3 | Next