Sugar cravings in menopause: sleep, serotonin and insulin

The sleep mechanism, which is the largest

Sleep restriction has measurable hormonal effects on appetite: ghrelin, which signals hunger, rises, and leptin, which signals satiety, falls. Studies restricting sleep in healthy volunteers reproduce this reliably.

The effect is not general. It skews preference specifically towards energy-dense, carbohydrate-rich food, and it also reduces activity in the prefrontal regions involved in inhibiting impulses.

So someone woken three times a night by night sweats faces both increased hunger drive and reduced capacity to override it. That is a physiological state, not a lapse.

The serotonin route

Oestrogen influences serotonin synthesis and receptor sensitivity, and falling oestrogen is associated with lower serotonin activity.

Carbohydrate intake raises tryptophan availability to the brain, transiently increasing serotonin. This is the basis for the long-standing observation that carbohydrate craving accompanies low mood, and it is why cravings often cluster with the mood symptoms of the transition.

The relief is real and it is brief, which is what makes the pattern self-repeating.

The insulin route

Insulin sensitivity declines across the transition. One consequence is a more pronounced glucose rise after a carbohydrate-rich meal, followed by a sharper fall as insulin overshoots.

That dip is experienced directly as hunger, shakiness, poor concentration and a craving for something sweet — which raises glucose again and repeats the cycle.

The practical implication is about meal composition rather than restriction: protein, fat and fibre alongside carbohydrate blunt both the rise and the subsequent dip.

What to address first

Sleep, because it is the largest single driver and because treating night sweats or insomnia frequently reduces cravings without anything being aimed at food.

Meal composition, because the glucose dip mechanism responds to what is eaten alongside carbohydrate rather than to eliminating it.

Alcohol, which lowers blood glucose some hours later, disrupts sleep, and reduces inhibition — three separate contributions to the same problem.

What tends not to work is framing it as willpower, because each of the mechanisms above operates below the level at which willpower acts.

When to see someone

Ask for HbA1c, thyroid function and ferritin if cravings are marked alongside fatigue. Prediabetes, thyroid disease and iron deficiency all present this way and all are common at this age.

Seek help for cravings that have become binge eating, or eating that feels out of control. Eating disorders occur in midlife and are substantially under-recognised in this age group, and they are treated.