Perimenopause typically begins in the early-to-mid 40s and can last 8–10 years. Hormonal swings drive changes in sleep, mood, body composition, cardiovascular risk, and bone density — yet most women receive little guidance beyond 'this is normal.' It is normal. It's also highly responsive to the right interventions.
What's actually happening
Estrogen and progesterone fluctuate erratically before they decline. Insulin sensitivity drops. Cortisol becomes more reactive. Sleep architecture changes. Muscle mass becomes harder to maintain, and visceral fat becomes easier to gain. None of this is your fault — but all of it is workable.
The core strategy
- Strength training 3x per week — the single highest-leverage habit in this window
- Protein at every meal: aim for 30+ grams, especially at breakfast
- Prioritize sleep with the same seriousness as training
- Manage stress actively — perimenopausal nervous systems are more reactive
- Get comprehensive labs, including a full hormone and metabolic panel
- Consider HRT, peptides, or GLP-1 therapy under medical guidance when indicated
The long view
Bone density, cardiovascular health, and brain health all benefit from interventions started in perimenopause rather than after. The women who feel strongest in their 60s and 70s usually started building that foundation in their 40s — not by doing more, but by doing the right things consistently.