Cravings for sweet and salty foods during perimenopause: a sign of a micronutrient imbalance

The intense cravings for sweet and salty foods that arise during perimenopause are almost always attributed to behavioral factors. The response to these cravings is advice on controlling, restricting, or sometimes eliminating sugar.

These responses fail, and for one specific reason: they address a hunger that is not really hunger.

What these cravings indicate is a shift in the estrogen-progesterone balance, the accompanying drop in serotonin—the brain chemical that moderates impulses—and a lack of cofactors—the vitamins and minerals essential for its production—which prevents the system from correcting itself.

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Physiological Hunger and Emotional Hunger: Two Distinct Systems

Physiological hunger responds to a genuine energy need. It is triggered by an empty stomach, the secretion of ghrelin—the hormone that signals hunger—and a drop in blood sugar levels. It sets in gradually, is not selective—any food will satisfy it—and subsides once the stomach is full.

Emotional hunger is linked to the reward circuits, where dopamine—the messenger of pleasure and motivation—and the body’s own opioids take over. It is not triggered by a lack of energy but by an internal state. It is sudden, highly selective, always focuses on the same food categories—sweet, fatty, and salty—does not subside with satiety, and often occurs even after a full meal.

This distinction is not merely a matter of terminology. Excessive physiological hunger relates to the amount of food consumed and the balance between proteins, carbohydrates, and fats. Emotional hunger relates to the brain’s chemical messengers and the nutrients needed to produce them. The two are not addressed using the same approaches.

Three specific times of occurrence guide this line of reasoning: late afternoon, between 4:00 and 6:00 p.m.; the second half of the cycle, in the days leading up to menstruation; and the morning after a short night’s sleep. These are three entry points into the same mechanism.

These symptoms are part of premenstrual syndrome, which is quite common: 80 to 90 percent of women experience at least one symptom before their periods, and about one in five experience symptoms severe enough to disrupt their daily lives. Perimenopause does not cause this syndrome; rather, it introduces it in women who previously did not have it and worsens it in others.

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What Lies Behind These Desires

1. An Imbalance in the Estrogen-Progesterone Ratio

Progesterone is secreted only by the corpus luteum, the small temporary gland that the follicle becomes once the egg is released. It is therefore present only during the second half of the cycle, and only if a successful ovulation has occurred. There are two distinct scenarios: either ovulation occurs but the corpus luteum secretes little progesterone or for too short a time, or there is no ovulation at all, meaning there is neither a corpus luteum nor progesterone.

In both cases, the cycle length may remain normal. This is the key point, and it is well established: regular cycles do not rule out the absence of ovulation, the frequency of which increases steadily throughout perimenopause. Therefore, regular periods do not guarantee the presence of progesterone.

The result: progesterone levels plummet while estrogen levels remain elevated, often in sharp spikes. The balance shifts, and it is this shift that characterizes the first stage of perimenopause, beginning in one’s forties.

This shift has a metabolic consequence. At stable levels, estradiol—the primary estrogen—helps cells respond properly to insulin, the hormone that transports sugar into cells. What matters here is not so much an excess as instability: when estrogen levels become erratic, this assistance becomes intermittent. Cells respond less effectively, the pancreas compensates by producing more insulin, and the same amount of carbohydrates causes blood sugar to rise higher, then drop lower and faster. It is these drops that trigger late-afternoon cravings.

Peak estrogen levels also increase the permeability of small blood vessels, which explains the water and salt retention and swelling that occur in the second half of the cycle.

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2. The natural anxiety reliever associated with the cycle has disappeared

Progesterone that crosses the blood-brain barrier is converted there into allopregnanolone, a molecule that acts directly on neurons. It enhances the action of GABA, the nervous system’s primary calming neurotransmitter, and serves as the natural anti-anxiety agent during the second phase of the cycle.

When progesterone production plummets, that support disappears. The nervous system becomes more easily overwhelmed, tolerance for frustration decreases, and the restraint that keeps impulsive behaviors in check loosens. Impulsive eating is just as much a part of this as irritability.

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3. Serotonin is running on low

Serotonin acts as a brake on impulses. When its activity declines, the symptoms are recognizable: intolerance to frustration, irritability, impulsivity, difficulty falling asleep, and a strong craving for sweets. These symptoms often begin earlier, with a marked worsening in the second half of the cycle.

Eating sugar is, therefore, a spontaneous corrective response, the mechanism of which has been established in the laboratory. It deserves to be explained, because it dispels any notion that these cravings stem from a lack of willpower.

Serotonin is produced from tryptophan, an amino acid that is obtained exclusively through diet. However, tryptophan does not freely cross the blood-brain barrier: it uses a transporter that it shares with several other amino acids, all of which are present in the blood in much greater quantities. Imagine a single border crossing and a line where tryptophan is always in the minority. So it’s not its absolute quantity that matters, but its proportion relative to its competitors.

That is exactly what a sugary food does. The insulin it triggers causes several of these competing amino acids to enter the muscles, without carrying away the tryptophan, most of which circulates bound to a blood protein. The queue clears, the tryptophan gets through, and serotonin production increases. The sense of relief that follows eating a square of chocolate is therefore the result of a biochemical process, not self-denial.

Calming and soothing neurotransmitters depend, among other things, on certain hormones:

• The GABA receptor, which helps reduce anxiety, is stimulated by allopregnanolone, a metabolite of progesterone (with the exception of 5 to 7 percent of women, who have the opposite reaction)
• Some physiological mechanisms involved in maintaining serotonin levels depend, among other factors, on estrogen levels.

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4. Cofactors are lacking

This is the part that is almost always overlooked, and it determines everything else.

Once tryptophan reaches the brain, it must still be converted into serotonin, and this conversion requires the active form of vitamin B6, which cannot be produced without magnesium. Without magnesium, vitamin B6 remains inactive, even if the diet provides sufficient amounts of it. The entire process therefore depends on two specific nutrients.

This active form of vitamin B6 also plays a second role: it is involved in the elimination of estrogen by the liver. The higher the estrogen levels, the more of it is mobilized by the liver, and the less remains to produce serotonin. This creates a vicious cycle: elevated estrogen levels deplete the cofactor necessary for serotonin production, serotonin levels drop, and the craving for sweets increases.

Laboratory studies also suggest that this same molecule modulates the way estrogen binds to its receptor, which could explain signs of excess estrogen even when hormone levels are strictly within the normal range. Caution is warranted here, as these observations have not been confirmed in women seen in clinical practice. Nevertheless, a normal hormone panel says nothing about tissue sensitivity, and many women are told that their test results show nothing abnormal.

As for magnesium, a deficiency is primarily a deficiency in intake. The recommended daily intake for adult women is 300 mg, whereas the average intake in France is around 280 mg: a large portion of the population falls short of this even before any additional loss occurs. Two very common factors exacerbate the situation: stress and caffeinated beverages, which increase magnesium loss in the urine. Coffee consumed to combat the 4:00 p.m. slump therefore actually depletes the very cofactor needed to counteract that slump.

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5. The cortisol rhythm has flattened out

Cortisol levels should never be interpreted based on a single value, but rather on its 24-hour profile. It peaks within 30 to 45 minutes after waking up, then declines until the evening. This curve flattens out with irregular sleep schedules, a lack of morning light, and prolonged stress, which deprives the body of the energy it needs most when it needs it most.

When it comes to salt cravings, we need to be cautious about a widely held explanation. The craving for salt is very real, and it should not be confused with a craving for sugar. However, the idea that the adrenal glands become “fatigued” after years of stress—leading them to produce less aldosterone, the hormone that retains salt—is not supported by solid evidence. A genuine aldosterone deficiency does exist, but it is associated with a specific and rare condition—adrenal insufficiency—which can be diagnosed and treated. This is why a strong and persistent craving for salty foods should not be suppressed but rather investigated by a doctor.

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The Insulin Spike, or Why the Benefits Don't Last

Carbohydrates that cause blood sugar to rise rapidly trigger a disproportionate insulin response, which causes too much glucose to enter the cells. Blood sugar levels then drop below their initial level, and the craving returns within an hour—often even stronger than before. This is the “roller coaster” effect, and it’s enough to turn a day into a series of meals without any real hunger being involved.

Sleep debt compounds this, and its effect is well documented: not getting enough sleep lowers leptin, the hormone that signals satiety, raises ghrelin, the hormone that signals hunger, and increases appetite the next day, with a preference for sugary and fatty foods. Yet sleep quality deteriorates precisely during this period, due to the same deficiency in allopregnanolone.

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The protocol

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1. Stabilize blood sugar levels first and foremost

• Include protein with every meal, including breakfast. This is the strategy that has the fastest effect on blood sugar fluctuations.
• Low-glycemic-index carbohydrates and firm textures: al dente pasta, basmati rice, sweet potatoes, whole grains—all served on the same plate with fiber and protein.
• No single carbohydrate. The same square of chocolate has a different nutritional profile depending on whether it is eaten after a meal or on an empty stomach.
• A ten-minute walk after a meal. The working muscles absorb glucose without needing insulin, which flattens the spike and the subsequent drop.

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2. Support serotonin production

• A palmful of nuts a day. Rich in tryptophan, omega-3 fatty acids, and B vitamins, they provide several key nutrients in a single serving.
• Long-chain omega-3s: small fatty fish, supplemented with chia seeds and flaxseeds that are ground just before consumption and stored in the refrigerator.
• Dark chocolate with at least 74% cocoa, no milk—two squares after a meal. Its magnesium content is too low to provide a significant amount; its benefits lie elsewhere, in its polyphenols.

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3. Restore the magnesium-vitamin B6 balance

The two are inseparable, since magnesium is essential for the activation of vitamin B6. This combination has been shown to have a more pronounced effect on the psychological symptoms and fluid retention associated with premenstrual syndrome than magnesium alone. This does not mean that it eliminates cravings; it means that addressing an insufficient intake is a sensible approach.

Additions: magnesium-rich mineral water, whole grains, nuts and seeds, legumes, and soy. Things to avoid: caffeine late in the day. The choice of form and dosage for any supplementation should be made in consultation with your therapist or pharmacist.

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4. Resynchronize the cortisol rhythm

• A set wake-up time and exposure to natural light within the hour that follows.
• Proactive rather than reactive eating. A planned snack at 3:00 p.m. has a lower metabolic cost than one eaten at 5:00 p.m.
• A 15-minute brisk walk whenever the craving strikes. The effect has been measured: a brisk walk reduces the craving for chocolate and the attention paid to the foods that trigger it.

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5. On the salty side

Reduce added salt and increase potassium intake through vegetables, legumes, and avocados. Excess salt not only causes water retention but also fuels inflammation. And a strong, persistent craving for salty foods warrants medical advice rather than an effort of willpower.

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When to Seek Medical Attention

Seek immediate medical attention if you experience very frequent and copious urination accompanied by intense and unusual thirst and weight loss; dizziness or tremors between meals; a craving for salty foods accompanied by dizziness upon standing; or a loss of control over eating that causes distress.

Seek remote care if your cravings are disrupting your diet or work, if you're gaining weight without any change in your habits, or if your fatigue doesn't go away even after resting.

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Conclusion

Cravings for sweet and salty foods during perimenopause are based on identifiable mechanisms: a reversed estrogen-progesterone balance, the disappearance of a natural anxiety-reliever, reduced serotonin levels, and insufficient vitamins and minerals to restore it. On the savory side, caution is still advised when attributing these cravings to the adrenal glands.

These mechanisms explain why cravings become more frequent and more intense during this time. They do not excuse inaction, and each person’s role depends on concrete steps: protein at every meal, well-chosen carbohydrates that are never consumed in isolation, a planned snack rather than an unplanned one, a few minutes of walking, adequate sleep, and sufficient intake of magnesium and B vitamins.

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Frequently Asked Questions

My hormone levels are normal—how can these symptoms be explained?

A blood test measures the amount of a hormone in the blood, not how tissues respond to it. Laboratory studies suggest that the active form of vitamin B6 moderates estrogen binding to its receptor, which could explain signs of excess even with normal levels. This hypothesis has yet to be confirmed in women, but it serves as a reminder that normal test results do not rule out symptoms.

My periods are regular—does that rule out perimenopause?

No. The length of the cycle depends mainly on its first half, before ovulation, whereas progesterone levels depend on the quality of the ovulation itself. A perfectly regular cycle can occur without ovulation, and this situation becomes increasingly common as perimenopause progresses.

Does dark chocolate provide a source of magnesium?

No, its cocoa content is too low for that. Its benefits come from its polyphenols—plant-based antioxidants—when it contains at least 74% cocoa, is milk-free, and is eaten at the end of a meal.

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