Diabetes affects men and women differently. Hormonal fluctuations across the menstrual cycle, pregnancy, and menopause create unique blood sugar management challenges that are rarely discussed openly. On International Women’s Day, we explore what every woman with diabetes deserves to know.
The Hormonal Blood Sugar Connection
Oestrogen and progesterone, the two primary female sex hormones, have direct and opposing effects on insulin sensitivity. Oestrogen generally improves insulin sensitivity, while progesterone tends to reduce it. As these hormones fluctuate across the menstrual cycle, blood sugar levels can shift in ways that feel unpredictable and frustrating.
In the week before menstruation, rising progesterone levels can cause significant insulin resistance, leading to higher blood glucose readings that seem unrelated to diet or activity. Many women with diabetes report needing to increase their insulin doses or reduce carbohydrate intake during this phase. Tracking your cycle alongside your blood glucose data can reveal these patterns and help you anticipate and manage them.
PCOS: The Overlooked Diabetes Risk Factor
Polycystic ovary syndrome (PCOS) affects approximately 10% of women of reproductive age and is strongly associated with insulin resistance and type 2 diabetes risk. Women with PCOS are four to seven times more likely to develop type 2 diabetes than women without the condition.
The relationship is bidirectional: insulin resistance drives the hormonal imbalances of PCOS, and PCOS worsens insulin resistance. Metformin is frequently prescribed for PCOS precisely because of its insulin-sensitising effects, even in women who do not yet have diabetes.
Women who develop gestational diabetes have a 50% lifetime risk of developing type 2 diabetes. This risk is highest in the first five years after pregnancy but persists lifelong. Annual blood glucose screening after a gestational diabetes diagnosis is essential, yet many women are not informed of this risk.
Menopause and Blood Sugar
The hormonal changes of menopause — particularly the decline in oestrogen — have significant effects on blood sugar management. Many women find that their blood glucose becomes harder to control during perimenopause and menopause, even without changes to diet or medication.
Oestrogen’s protective effect on insulin sensitivity is lost, and the redistribution of body fat towards the abdomen that accompanies menopause further increases insulin resistance. Hot flushes and night sweats can disrupt sleep, which independently raises blood glucose through cortisol and growth hormone effects.
Hormone replacement therapy (HRT) can improve insulin sensitivity and blood glucose control in some women with type 2 diabetes during menopause, though the decision should be made individually with a healthcare provider.
Diabetes Complications in Women
Women with diabetes face a disproportionately higher cardiovascular risk compared to men with diabetes. While diabetes roughly doubles the cardiovascular risk in men, it triples or quadruples the risk in women. Yet women with diabetes are less likely to be prescribed statins, aspirin, or ACE inhibitors than men with the same risk profile.
Women with diabetes are also more susceptible to recurrent urinary tract infections and vaginal thrush, both of which can be exacerbated by elevated blood glucose. Maintaining good glycaemic control is the most effective prevention strategy.
Diabetes in women is shaped by hormonal biology in ways that are often under-recognised and under-researched. Tracking blood glucose alongside the menstrual cycle, understanding the PCOS-diabetes link, preparing for the metabolic changes of menopause, and advocating for equal cardiovascular risk management are all essential steps for women living with diabetes.
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