Some women experience a stronger appetite and a pronounced preference for sweet foods in the days before menstruation. Weight can also rise temporarily because of fluid retention, bloating, and bowel changes. That does not mean the same amount of body fat was gained in a few days.
Premenstrual syndrome (PMS) is a recurring group of physical, emotional, and behavioural symptoms that appears in the luteal phase and eases after menstruation begins. The useful question is not which “hormonal imbalance” explains every symptom, but whether your symptoms follow a consistent cycle pattern.
Why appetite changes before menstruation
Across the cycle, the nervous system, sleep, digestion, and appetite-related signals change. Studies of energy intake do not all agree, but some women consume slightly more energy in the second half of the cycle. Individual differences are large: some notice little change, while others feel hungrier or crave particular foods.
Sweet cravings are unlikely to have one simple cause such as a single serotonin deficiency. Poor sleep, stress, stronger hunger after excessive restriction, mood changes, and the learned reward of sweet foods can all contribute. It is more useful to work on meals, sleep, and stress than to search for one miracle supplement.
Why weight may rise temporarily
Bloating, swelling, bowel changes, and a feeling of abdominal heaviness are common premenstrual experiences. The scale may show a sudden increase even though body fat changes much more slowly over such a short period. Compare weight on similar cycle days rather than with the lightest morning of the month.
Do not compensate with starvation, diuretics, or severe fluid restriction. Swelling that is severe, persists outside the cycle, or occurs with shortness of breath, pain, or one-sided leg swelling needs medical assessment.
How to tell whether it is PMS
Keep a simple diary for at least two cycles. Record sleep, mood, hunger, sweet cravings, bloating, pain, bleeding, and how much symptoms interfere with daily life. PMS is defined by its pattern: symptoms recur before menstruation and ease after it starts.
If anxiety, irritability, low mood, binge eating, or other symptoms seriously disrupt work or relationships, speak with a gynaecologist. Very severe emotional symptoms may indicate premenstrual dysphoric disorder (PMDD), which should not be managed with diet alone. Seek urgent help for thoughts of self-harm.
How to reduce sweet cravings without rigid rules
First check whether your main meals have become too small. A meal with protein, vegetables or other tolerated fibre, and enough fat is usually more satisfying than coffee and a tiny snack followed by returning hunger.
Sweet foods do not have to become absolutely forbidden. A planned small portion after a normal meal can be easier to manage than hours of restriction followed by overeating. Put it on a plate instead of eating from the package. If the craving is driven by exhaustion, address sleep, water, a walk, or a proper meal first.
Eating every two hours is not mandatory. Some people feel better with smaller, more frequent meals, while others prefer their usual schedule and complete portions. Use hunger, satiety, tolerance, and a calm relationship with food as your guide.
What to do about bloating and fluid retention
Keep your usual fluid intake and do not try to “dry out” the body. Walking and familiar physical activity may improve wellbeing, although exercise research in PMS is not uniformly strong. Salt does not need to be eliminated; extreme restriction is not a universal treatment for swelling.
Notice foods that personally increase bloating, such as large amounts of fizzy drinks, sugar alcohols, very salty foods, or foods you do not tolerate. Do not immediately remove dozens of food groups or treat “oestrogen dominance” as a diagnosis. The phrase is often used in marketing and does not explain every symptom.
Which supplements and treatments are worth discussing
Calcium has been studied more thoroughly than many popular products. In a clinical trial, 1200 mg of elemental calcium daily reduced overall PMS symptom severity compared with placebo, but that does not mean the dose is appropriate for everyone. ACOG also notes possible benefits from calcium and, for selected symptoms, magnesium. Supplements can interact with medicines and may be unsuitable with kidney disease.
Do not self-prescribe high-dose vitamin B6, diuretics, “hormone balance” blends, or evening primrose as universal solutions. Evidence for many advertised products is limited, and excessive supplementation can cause harm. Depending on the symptom pattern, a clinician may discuss pain medicines, hormonal contraception, or antidepressants with stronger evidence for selected patients.
How to account for PMS on keto and LCHF
On keto, sweet cravings do not automatically mean that you must increase carbohydrates or restrict them further. Check protein, energy intake, sleep, and your usual electrolyte routine first. A very large calorie deficit and constant suppression of hunger can promote overeating regardless of cycle phase.
If you remain low-carb, prepare a suitable meal in advance: eggs, fish, meat, or cottage cheese with vegetables, and, if tolerated, berries or a dessert without added sugar. If strict keto clearly worsens symptoms, review the eating pattern with a qualified professional. Never change diabetes or blood-pressure medication doses on your own.
When to seek medical help
See a clinician if symptoms are new, progressively worse, continue after menstruation, or include very heavy bleeding, severe pain, fainting, or marked weakness. Similar symptoms can occur with anaemia, thyroid disease, depression, anxiety disorders, endometriosis, and other conditions.
A symptom diary helps a clinician see the cycle relationship and evaluate treatment. Self-diagnosis from abdominal shape, sweet cravings, or a single hormone test is not enough.
Conclusion
Premenstrual sweet cravings and temporary weight gain are common but not inevitable. Track the pattern, do not punish yourself with starvation for scale changes, build satisfying meals, protect sleep, and keep familiar activity. When symptoms interfere with life every month, seek a proper assessment and an appropriate treatment plan.
Sources
- Premenstrual Syndrome (PMS) — American College of Obstetricians and Gynecologists
- PMS (premenstrual syndrome) — NHS
- The Effect of the Menstrual Cycle on Energy Intake: A Systematic Review and Meta-analysis — Nutrition Reviews, 2024
- Calcium carbonate and the premenstrual syndrome: effects on premenstrual and menstrual symptoms — American Journal of Obstetrics and Gynecology
- Exercise for premenstrual syndrome: a systematic review and meta-analysis of randomised controlled trials — BJGP Open
