In the 80s and 90s, most diet programs called for very low fat, low protein and extremely high carbohydrate. The Pritkin diet, which recommended 70% carbohydrate, 20% protein and 10% fat, is one example. Other programs falling into this category are the Dean Ornish's "Eat More Weigh Less" program, Robert Hass's "Eat to Win" and vegetarianism.
If the right types of carbohydrates are eaten, this is probably a healthy way to eat, but it's so lopsided in favor of carbohydrates, you can't really say it's "balanced" and this approach definitely isn't for everyone. When it comes to shifting body composition from fat to muscle, many people simply don't respond well to high carbohydrates, no matter how carefully they are chosen. Very high carbohydrate, low fat diets are also a bit light on essential fats, and the protein levels are too low to support serious weight training. Some extremely carbohydrate-sensitive people actually see increases in cholesterol and triglycerides when their carbs are too high.
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