Low fat diets resulted in high carb intake for most people. This meant more processed and fast foods. These types of foods have lots of unhealthy carbs and tend to be very high in calories. Not surprising why people in North American got fat.
Saying we should eat vegetables isn't exactly an earth shattering finding.
Low carb is a great way to avoid bad foods. Tough to get 600g of carbs from vegetables/meat products, but rather easy to get it if you eat processed foods. Most people lead a sedentary lifestyle and simply do not need that many carbs.
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