A recent Harvard study highlights a critical factor behind stubborn weight gain in millions of Americans. When metabolic health declines over time, the body becomes less efficient at burning fat, leading to low energy, slow metabolism, and weight that becomes increasingly difficult to lose.

What’s alarming is that this process often happens silently. As the years go by, many people follow the same routines, unaware that their metabolism is gradually working against them — making traditional dieting and exercise far less effective.