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How can I stay lean in my 30s? Expert tips for maintaining a healthy physique

As you enter your 30s, your body's metabolism can begin to gradually slow down, with muscle mass decreasing by an estimated 3–8% each decade. Effectively countering these shifts is key to understanding **how can I stay lean in my 30s**, and it involves more than just diet and exercise. An authoritative approach includes lifestyle adjustments like managing stress and prioritizing sleep.