Why You're Tired in Midlife — and What to Do About It

Fatigue in your 40s and 50s is rarely about one thing. It's almost always a stack of overlapping issues: declining sex hormones, less restorative sleep, slowly creeping insulin resistance, chronic low-grade stress, and often a few unaddressed nutrient deficiencies.

The first place we look is hormones. For women, perimenopause begins as early as the late 30s. For men, testosterone decline is more gradual but equally impactful on energy, motivation, and body composition.

Next is sleep architecture, then metabolic health, then micronutrients — iron, vitamin D, B12, magnesium, and a full thyroid panel including free T3 and reverse T3.

The good news: each of these is measurable, and most are highly modifiable. If you've been told 'your labs are normal,' it's worth a second, more thorough look.