More muscle power means lower Alzheimer's risk

But even after the researchers adjusted for age and education level-which can influence Alzheimer's risk-they found that muscle strength had a strong influence on the risk of the disease. People who ranked in the top 10 percent for muscle strength were 61 percent less likely to develop Alzheimer's than the weakest 10 percent. Stronger people also showed a slower decline in their mental abilities over time.

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Strong people are harder to kill than weak people and more useful in general. - Mark Rippetoe.