Gary Brecka says the biggest mistake people make losing fat is not lifting weights. Muscle mass is the single best marker of longevity. Resistance training preserves muscle, improves insulin sensitivity, and grip strength and thigh size predict how long you live.
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What is the best way to lose fat without losing muscle? The single biggest marker for longevity is your muscles. So actually learn to be comfortable with weight training. Resistance training not only builds muscle, but it lowers your glycemic profile, helps your body become more sensitive to insulin. Your muscles are like a sponge for glucose. Also, frailty is one of the greatest risks in older ages. We know that grip strength is correlated to longevity. We know that thigh circumference is correlated to longevity. The simple sentence is, if you wanna live a long time, lift heavy weight. Our muscles are a metabolic currency, so don't waste them. Stimulate them and live a long time.