Quick question: what's the leading cause of death in women? If you guessed breast cancer, you're in good company. But it's heart disease, and in one US survey only 56% of women knew that.
Women tend to develop heart disease several years later than men. The menopause transition is now recognised as the moment that risk starts to speed up. The upside? That makes midlife a golden window for prevention.
What changes, and why it matters#
Estrogen is a bit like a bodyguard for your blood vessels, protecting their linings and keeping inflammation in check. As it bows out, long-term studies following women through menopause have found changes that go beyond normal ageing:
- Cholesterol jumps. Total cholesterol, LDL ("bad") cholesterol and apolipoprotein B rise sharply from the year before to the year after the final period, independent of age.
- "Good" cholesterol changes its tune. Before menopause, higher HDL is linked to healthier arteries. Afterwards, that link can reverse, so a high HDL number may not mean what it used to.
- Metabolic syndrome becomes more common. That's a cluster of raised blood pressure, blood sugar, waist size and blood fats, and it progresses fastest in late premenopause and perimenopause.
- Arteries stiffen. Artery walls thicken and stiffen faster, especially in late perimenopause and within a year of the final period.
- Blood pressure, insulin and blood sugar also tend to rise, though these seem driven more by age than by menopause itself.
The AHA statement reports that women are about twice as likely to have high LDL cholesterol in early postmenopause as before it. That's why so many women watch their cholesterol numbers climb around their final period, even though nothing about their diet or exercise has changed.
The "weight gain" mystery, solved#
Here's what shifts:
- About 2 years before the final period, the rate of fat gain doubles and lean muscle starts to decline, continuing until about 2 years after.
- Fat moves toward the belly, including visceral fat: the deep fat that wraps around your internal organs like packing material and is linked to chronic disease. Studies show visceral fat increases across menopause even after allowing for age and overall weight (Toth et al., 2000 (opens in a new tab)).
- Fat around the heart also increases after menopause, independent of age.
Try this at home: your waist-to-hip ratio#
Your waist-to-hip ratio is a quick check you can do at home. Like waist size, it can reveal belly fat that BMI misses:
- Measure in the morning, standing relaxed (don't hold your tummy in), after emptying your bladder.
- Measure your waist at its narrowest point, or at your belly button if you don't have an obvious waist.
- Measure your hips around the widest part of your bottom.
- Divide your waist measurement by your hip measurement.
The World Health Organization defines abdominal obesity in women as a ratio above 0.85, and for women of Asian background suggests a healthy ratio of 0.80 or under (Harvard T.H. Chan School of Public Health (opens in a new tab)). Your doctor can tell you which figure applies to you.
Who's at higher risk?#
- Early or premature menopause: menopause before 45 is linked to a 50% higher risk of coronary heart disease and a 33% higher risk of heart failure.
- Surgical menopause: having both ovaries removed before about 40 to 45, without hormone therapy, carries substantially higher heart risk. A hysterectomy that keeps the ovaries was not linked to higher heart risk.
- Frequent or early hot flashes: linked to worse cholesterol, insulin resistance, high blood pressure and early artery changes. Menopausal symptoms were linked to a 28% higher risk of coronary heart disease after accounting for other factors.
- Poor sleep and depression: both linked to signs of artery disease in midlife women.
What you can do, starting now#
- Know your numbers: cholesterol, blood pressure, blood sugar and waist size.
- Ask for a heart check. The North American Menopause Society recommends every midlife woman has a formal heart risk assessment. The AHA statement backs this and calls for menopause to be counted as a heart risk factor in future guidelines.
- Lean on lifestyle. In the only trial designed specifically for women going through the transition, a 5-year diet and exercise programme prevented weight gain, blunted the rise in LDL cholesterol, and lowered blood pressure, triglycerides, blood sugar and insulin. It even slowed artery thickening.
- Stack your healthy habits. Women in the Nurses' Health Study who combined several healthy habits had about 83% lower risk of coronary events over 14 years. Only 3% of women managed all of them, which means there's huge room to gain.
