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"I try to pay attention to my diet, but I can't seem to find the time to eat properly." Sound familiar? As a personal trainer, I hear this complaint more times than I care to remember. Today's busy lifestyle has made fast-food a staple in the nutritional schemes of millions of Americans. Many seem to feel that a burger and fries provides a sufficient balance of protein and carbohydrates! Unfortunately, it is this lifestyle that helps to account for the fact that more than 80% of our population is overweight or obese.

Recently, meal replacements have been touted as a solution to this problem. They are conveniently packaged in powder form and can be mixed into an easy-to-drink shake in a matter of minutes. At a cost of less than two dollars per serving, they are, without question, a cost-effective way to get a quick meal.

Meal replacements came into prominence several years ago, when a company called Myoplex introduced a unique formula that was unlike anything else on the market. This revolutionary product was billed as a means to build muscle and reduce bodyfat. Endorsements were obtained from a host of high-profile athletes and fitness personalities, and an extensive advertising campaign was undertaken to promote its performance-enhancing benefits. It did not take long for other supplement manufacturers to jump on the bandwagon. Attempting to capitalize on the immense popularity of this concept, a variety of new brands flooded the marketplace (including Rx-Fuel, Perfect Rx, Met-Rx, and others), all professing to be an easy way to a better body. But are these claims valid or is this just a lot of marketing hype?

In order to evaluate the efficacy of meal replacements, it is necessary to understand their nutritional composition. Essentially, these products are a high protein, low fat, moderate carbohydrate food source that is rich in vitamins and minerals. They are designed to provide a maximal amount of nutrients in a format that is not inclined to promote significant bodyfat storage. On average, each serving contains approximately 250 calories, and is made with both natural and artificial ingredients.

Unlike many of today's popular "diet shakes", meal replacements are very low in simple sugars. Because simple sugars are rapidly assimilated into your blood stream, they tend to cause a corresponding surge in your insulin levels. This oversecretion of insulin produces a spillover effect that is directly associated with increased fat storage. In fact, sugar-based products can actually promote greater bodyfat levels than high fat foods, making them highly undesirable for maintaining a lean, healthy physique. Instead of simple sugars, meal replacements use complex-carbs that enter your blood stream in a "time released" manner. This helps to stabilize insulin secretions, minimizing the potential for excess fat deposition.

Additionally, these products obtain their protein from high-quality whey and egg sources rather than cheaper alternatives. By nature, whey and egg proteins are maximally absorbed into your body. This allows a greater amount of protein to be utilized for important functions such as tissue growth and repair-a critical factor if you are a serious athlete. On the other hand, since this protein is animal-based in nature, these products would be inappropriate to those on a strict vegan diet.

Considering that they are also low in fat and abundant in vitamins and minerals, meal replacements can be a very attractive nutritional option with wide ranging applications. However, this does not mean that you should haphazardly drink shakes whenever you feel hungry. Rather, you must employ them in an appropriate context in order to derive maximal benefits.

As a rule, these products are best utilized as an adjunct to a well-balanced nutritional regimen-not as a substitute for natural foods. Meal replacements fill a specific dietary niche, but by no means are a complete source of nutrition. Hence, their overuse can lead to a disparity in dietary ratios as well as a deficiency in vital nutrients. Moreover, when consumed in excess, the high protein content can sometimes be damaging to your system, potentially leading to kidney ailments and other maladies. A diverse combination of natural foods is the best way to satisfy all of your nutritional requirements, ensuring an optimal intake of proper nutrients.

In practice, it is best to eat a hearty breakfast, lunch and dinner, using shakes as interim meals. It is widely recognized that a diet consisting of small, frequent meals spaced out every two to three hours provides optimal nutritional utility. Eating in this fashion increases metabolic function and regulates insulin levels, allowing your body to operate at peak efficiency. Furthermore, it helps to suppress hunger and thus prevent the temptation to snack on "empty calorie" foods that are high in fat and sugar. However, the majority of people find it difficult to adhere to this rigid schedule. Preparing five or six meals a day can become an arduous task, causing even the most devoted supporter to abandon this type of regimen. Fortunately, meal replacements provide the perfect remedy to this situation. They are convenient and easy to prepare, facilitating your ability to consume quality nutrients at regular intervals without expending a great deal of effort.

It is important to realize, though, that these products will not build your muscles or make you stronger. There is a prevailing misconception that they have powerful, steroid-like effects and will miraculously transform you into a muscular Adonis. However, despite the hype, muscular size can only be increased through intense anaerobic exercise. Although they can help in the muscle building process when combined with a dedicated weight-training regimen, simply adding meal replacements to your diet will have no effect on building larger muscles!

In final analysis, while meal replacements are not a panacea, they certainly can play a role in your nutritional scheme. They are a healthful, well-conceived food source that provides a convenient, cost-effective way to supplement your diet. Whether you are a serious athlete or just a health-conscious consumer, these products are worth careful consideration.

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