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DESCRIPTION: The lifespan extension associated with dietary restriction may be due less to a reduction in calories, and more to a reduction in animal protein (particularly the amino acid leucine, which may accelerate aging via the enzyme TOR).

What's TOR? Make sure you go back and watch my "prequel" video Why Do We Age? (http://nutritionfacts.org/video/why-do-we-age).

This reminds of the study I profiled in The Benefits of Caloric Restriction Without the Actual Restricting (http://nutritionfacts.org/video/the-benefits-of-caloric-restriction-without-the-actual-restricting).

Methionine is another amino acid that may be associated with aging. See Methionine Restriction as a Life Extension Strategy (http://nutritionfacts.org/video/methionine-restriction-as-a-life-extension-strategy/) to find out which foods to avoid in that case. Both leucine and methionine content may be additional reasons why Plant Protein is Preferable (http://nutritionfacts.org/video/plant-protein-preferable/).

Other reasons why those eating plant-based diets may live longer:
• Glycotoxins (http://nutritionfacts.org/video/glycotoxins/)
• One in a Thousand: Ending the Heart Disease Epidemic (http://nutritionfacts.org/video/one-in-a-thousand-ending-the-heart-disease-epidemic/)
• Food Antioxidants and Cancer (http://nutritionfacts.org/video/food-antioxidants-and-cancer)
• Food Antioxidants, Stroke, and Heart Disease (http://nutritionfacts.org/video/food-antioxidants-stroke-and-heart-disease)
• Nuts May Help Prevent Death (http://nutritionfacts.org/video/nuts-may-help-prevent-death)
• Increased Lifespan From Beans (http://nutritionfacts.org/video/increased-lifespan-from-beans/)

This all may help explain the results of Harvard's Meat and Mortality Studies (http://nutritionfacts.org/video/harvards-meat-and-mortality-studies/).

Have a question for Dr. Greger about this video? Leave it in the comment section at http://nutritionfacts.org/video/caloric-restriction-vs-animal-protein-restriction/ and he'll try to answer it!

Image Credit: Great Beyond via Flickr.

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