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Does that imply that lifting, building up one's body and consuming excess calories to bulk up is somehow stressful for the body's metabolic aging process?

Absolutely, yes.

Although gaining muscle is much healthier than gaining adipose tissue, the implication of the article (and an abundance of empirical evidence) is that eating itself is a stressful process. Eating is the vector through which you expose yourself to oxidative stresses and pathogens. Eating less but still meeting your caloric needs would mean minimizing exposure to these risk factors.

In a sense, yes - to build up your muscles they must first be broken down, a cycle which is going to create some amount of stressful churn. If you think about any machine, a higher operating energy/intensity generally correlates to faster breakdown.

At the same time, humans in good shape are definitely healthier, and too much calorie restriction can lead to malnourishment.

There's a sweet spot somewhere, proponents of calorie restriction are basically saying to err on the side of eating less.

I think it's the sort of activity that matters. Low impact exercise wears on your joints/etc less than higher intensity stuff (think swimming or walking compared to running).

I read somewhere that physical activities are stressful but then make your body more resistant to oxidative stress, which may explain the paradox of physical activity like lifting improving health and longevity. So maybe caloric restriction compared to slight calorie excess+muscles might end up being relatively equal in terms of longevity

whether you are muscular or skinny, you have the same set of organs. The fact you are 30 percent bigger in mass means all your organs (heart, liver, kidney, muscles, ...) are working much harder than if you had less mass.

>your organs are working much harder

That's very misleading logic. You make it out that your organs working much harder is a bad thing in all cases. That's not true.

When you exercise, your organs work much harder. Yet it is much better to exercise and have your organs work harder than to not exercise at all.

It's probably not so simplistic one way or the other. However, some organs do function as filters, so overloading them would be detrimental.

Adding 30% body mass I would be a very large increase...almost no one but the most dedicated lifters could do that.

That's wrong. The heart grows proportionally with effort ( hence why pro athletes have troubles later in life.

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