Why is it so difficult to tell what makes us healthy or unhealthy?

Essentials Of Human Development
1st Edition
ISBN:9781285647357
Author:Kail
Publisher:Kail
Chapter14: The Personal Context Of Later Life: Physical, Cognitive, And Mental Health Issues
Section14.1: What Are Older Adults Like?
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Why is it so difficult to tell what makes us healthy or unhealthy?  As new research is presented, sometimes earlier recommendations for what foods and activities are considered healthy need to be modified.  Should recommendations be followed, knowing that they may change in the future, or should you just ‘go with your gut’ (haha, that was an eating pun)?  As more data accumulates and studies are conducted with larger groups people over longer periods of time, are we getting closer to determining what constitutes a healthy lifestyle?  Or are individual people variable enough in physiology (inability to metabolize lactose, gluten sensitivity, etc.) and genetics that universal recommendations are unrealistic?

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