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Low-fat, low-carb or high-protein? The kind of diet doesn’t matter, scientists say. All that really counts is cutting calories and sticking with it, according to a federal study that followed people for two years. However, participants had trouble staying with a single approach that long and the weight loss was modest for most. As the world grapples with rising obesity, millions have turned to popular diets like Atkins, Zone and Ornish that tout the benefits of one nutrient over another.

A turning point in his research occurred in 1982. That year, the Nobel Prize in Medicine was awarded for discoveries of the role that specialized hormones, known as eicosanoids, play in the development of cardiovascular disease, diabetes, auto-immune diseases, and cancer. Since eicosanoids are only generated from dietary fat, Dr. Sears reasoned that one could apply intravenous drug delivery principles to nutrition in order to control these exceptionally powerful hormonal responses with laser-like precision. In essence, his approach treats food as if it were a drug.

Health met physics in last week's New England Journal of Medicine with a study revealing that the type of diet doesn't matter so much for weight loss — be it low-fat, low-carb, 70-percent yak meat or whatever — as long as one simple requirement is met: Consume fewer calories than you burn. The discovery harkens back to the Age of Enlightenment and the law of conservation of energy, a concept lost in the fad-diet world for the last 200 years. That said, not all diets are created equal.

According to company spokesperson Charlie Lynch, "The reason to buy acai berry products is to get the nutritional benefits that this remarkable fruit offers. But there are wide differences in nutritional value from product to product." He adds "In order to reap the benefits of acai you must buy the most potent products." Unlike most acai berry related websites, the Organic-Acai-Berry.com website explains how consumers can distinquish between the highest quality acaiberry products and those of lesser quality.