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But by the 1970s there's a significant shift that hoped to prevent chronic illnesses like heart disease. Now, emerging science determined that the food we've been eating for hundreds of thousands of years, red meat, saturated fat, and cholesterol, were now killing us. And as a result of this, today we now weigh 30 more on average and heart disease is the leading cause of death. And before you jump the gun and say that's all about excess calories, the 1941 dietary guidelines recommended that an adult male weighing a hundred and fifty five pounds should consume 3,000 calories per day. But the real problem is that since 1960, our consumption of processed foods, seed oils, and rich grains, high fructose corn syrup, artificial sweeteners, and pesticides has gone up. And oddly, our beef consumption has gone down 40%. So maybe we got it all wrong.