Cut your Protein why no Sugar?

The case against sugar is a complex one. Besides the fact that refined sugar is a totally unnatural substance that has been stripped of its nutritional value—fiber, vitamins, and minerals—apart from the calories it provides, sugar in concentrated form is very hard on the pancreas. The pancreas, which is responsible for the production of insulin and therefore the regulation of blood sugar and energy levels in the body, has adapted through evolution to deal with a steady flow of glucose in small quantities such as those that result from the intake of complex carbohydrates.

One of the biggest beauty cons of all is the idea that if you eat lots of protein your muscles, skin, hair, and nails will grow strong and you will stay young. Like the old-fashioned high protein diet for building up athletic strength, it doesn't work. The human need for protein has been grossly exaggerated. At the turn of the century, respected opinion held that we need between 120 and 169 grams of protein per day. Then Chittenden showed in human experiments that far better performance and health were possible on fifty grams, a much lower amount. Another scientist named Hindhede set the figure at thirty grams. Then Oomen in Amsterdam and Hipsley in Canberra discovered a population in Australia which develop not only full health, but exceptional muscular structure and performance on a diet of merely 15 to 20 grams of protein per day.

Later in the United States, the American Research Council's Food and Nutrition Board agreed on a daily requirement of 70 grams for adults. One member of the board, named Sherman, described how this figure was arrived at. The evidence the committee examined indicated that a much lower amount was needed, somewhere around 35 grams, but there was agreement that if so low a figure had been set there would have been a public outcry, so a corresponding "margin of safety" was decided on and the 70-gram figure was published. But because the scientific basis for the figure was nonexistent, the word "recommendation" was chosen instead of "requirement." Current recommendations for protein intake hover about the 50-gram mark, although there is strong evidence now that we probably need even less.

Your body needs amino acids, the constituents of protein, for its metabolic processes, for growth and the repair and maintenance of body tissue. Proteins are made up of twenty-two different amino acids; all but eight of them your body can manufacture itself. These eight, which have to be taken in through your foods, are referred to as "essential" amino acids.

A large portion of a protein molecule is made up of nitrogen, and one of the important things about taking protein is that it helps keep a good nitrogen balance in the body, so there is as much nitrogen coming into the body as there is leaving it. This balance helps maintain body health and muscle strength, so that you don't go into what is known as a negative nitrogen balance, when you lose muscle tissue from your body. To keep your nitrogen right, 10 to 15 percent of your total calorie intake should be from protein.

But when a greater percentage than this of your calorie intake comes from protein foods, then your body goes into a negative mineral balance and you start gradually losing precious minerals and trace elements such as zinc, calcium, magnesium, iron, potassium, and chromium from your system. These nutrients, so easily lost from the body, are vital not only to physical health but also to emotional stability and well-being (more about minerals later). Wachmann and Bernstein of the Department of Nutrition at Harvard University investigated the high protein diet and came to the conclusion that the protein-rich (especially the meat-heavy) diet plays a strong role in the genesis of osteoporosis, a softening of the bones, particularly in women after menopause, caused by the loss of minerals. This is probably because of the high protein diet's tendency to leach valuable minerals (in this case calcium) from the system. And purely from the point of view of physical beauty, many of these lost minerals, such as sulfur, selenium, zinc. magnesium, and calcium, can make the difference between prematurely aging skin caused by a rapid collagen and elastin breakdown, nails that split, or hair in poor condition, and radiant looks glowing with strength and health.

Finally, the breakdown and metabolism of proteins in the body lead to the formation of a number of complex by-products such as urea, nitrogen, and ammonia, which can be toxic. These wastes need to be eliminated. This isn't always easy, and it puts great strain on the liver and kidneys. This is why, on the well-known high protein reducing diets, you are advised to drink large amounts of water in order to water down these poisons and help excrete them.

What kind of carbohydrate? continue...

Protein

The amount of protein needed by athletes is a controversial subject which has been debated for many years. Traditionally, weightlifters and athletes in other 'power' sports have believed that consuming vast quantities of protein will enhance muscle development. On the other hand, scientists have generally maintained that the protein needs of all athletes can be met by the same recommended daily allowances (RDA) as those for sedentary individuals.

Many research studies over the past decade have not resolved the controversy. However, as a very small amount of protein is used for energy during endurance sports, certain researchers now believe that the RDA of 0,8 grams per kilogram body mass per day might be insufficient for those who are involved in endurance-type exercise. Some (but not all) studies also seem to indicate that exercise which needs a good deal of strength (such as weight-lifting) may increase protein requirements. At the same time, there is no evidence that excessive amounts of protein (such as the 2-2,5 grams per kilogram body mass, per day commonly consumed by power trainers) will have any added benefit.

How much protein does an athlete in fact require? While there are no definite recommendations, studies have suggested this may be between 1 and 1,5 grams per kilogram body mass per day or 12 to 15%of the total energy intake. But before you reach for that protein _supplement, it must be emphasised that protein deficiencies among athletes are extremely rare. For example, a diet consisting of 14 300 kilojoules (3 400 calories), 14 % of which is derived from protein, provides about 119 grams of protein. An athlete who weighs 80 kg will therefore consume about 1,5^-grams of protein per kilogram per day. This diet is thus quite capable of supplying the increased protein requirements of strenuous physical activity.

Vitamins

Vitamins play an important role in regulating and assisting the breaking down of macronutrients for energy production and muscular contraction, as well as the formation of red blood cells. All of these functions are essential in exercise performance. Two questions are usually asked when looking at the vitamin-exercise connection:

• Does exercise affect vitamin requirements?
• Does vitamin supplementation improve exercise performance?

Vitamin requirements depend on the energy source of the working muscle. Exercise has been shown to increase the need for vitamin C and riboflavin (vitamin B2). However, it has also been proved that supplementation fails to increase the ability of athletes to train. Low thiamine (vitamin B1) intakes show no measurable effect on performance. Vitamin deficiencies in sportsmen and women are very uncommon and any increased demand for vitamins is usually met simply by the increased overall energy intake of the athlete. Studies of the effects of vitamin supplementation on performance have consistently found that there is no improvement in performance in athletes who have a balanced diet with an adequate vitamin intake. However, special care must be taken by those athletes who consume less than 5 000 kJ (1 200 cal) per day to ensure that their diets contain enough in the way of vitamins. This low energy intake is more common among female endurance athletes and ballet dancers.

Minerals

Like vitamins, minerals play an essential role in various exercise- related functions. The most important macrominerals and trace elements in an athlete's diet are sodium, potassium, magnesium, calcium and iron.

Sodium and potassium, which are usually referred to as 'electrolytes', play a major role in the amount of fluid in the body. Trivial amounts of both are lost in sweat, but even those athletes who sweat excessively rarely need to supplement their diets with either salt (sodium chloride) or potassium. The average diet contains 3 to 4 times more salt than necessary and simply by eating sufficient fresh fruit and vegetables, our potassium requirements are easily met. Magnesium deficiency is rare in athletes, partly due to the fact that it occurs in many foods and partly because sweat losses are very small. Magnesium does play an important role in the formation of glycogen, the storage form of carbohydrate in muscles and the liver.

Iron plays a major role in relation to exercise. The lack of it is the most common nutritional deficiency in the world and the most important in relation to runners, especially female runners. Energy intakes of less than 5 000 kJ (1 200 cal) are not enough to supply the amount of iron which a female sportswoman needs. Iron supplementation may then be necessary.

Water

Water can also be referred to as a nutrient as it is so essential to life. One of its many functions in exercise is that of heat regulation. The amount of water needed during an exercise event depends mainly on the duration and intensity of the exercise and the body weight of the athlete. As a general guide, 500 ml per hour is thought to cover most athletes' requirements.