From Thyroid to Stress: 13 Hidden Reasons Behind Unexplained Weight Gain

So why do some people gain weight even while eating healthy foods and exercising? Hormonal imbalances—rather than poor lifestyle habits—are often to blame. Thyroid issues, sleep apnea, and insulin resistance are common examples. This is why a thorough evaluation of lifestyle, nutrition, sleep, and stress is vital, even when things appear “healthy” on the surface.