So what gives you low blood flow in your brain? Caffeine constricts blood flow to the brain. Nicotine, marijuana, alcohol, not sleeping, being overweight. I published three studies on 33,000 people. As your weight goes up, the size and function of your brain goes down. which would scare the fat off anyone. Being sedentary, you know, little kids, when I was a little kid, we're out all the time, out playing, play, play. (25:01–25:07)
CLAIM
Asserts that increased weight negatively affects brain size and function.
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