Period weight changes, how to read the scales calmly across your month
A rise of 1 or 2lb in the days before a period is usually water and a fuller gut, not new body fat. The number tends to settle when bleeding starts. The useful habit is to compare like with like, the same point of each cycle, rather than Monday against Monday.
A club coach goes through your situation with you and gives you practical advice.
Book your free assessmentIn this article
Why the number climbs for a few days
Hormone levels rise and fall through the month. In the run up to a period, many women hold on to more fluid and feel more bloated. Digestion can also slow a little, so there is simply more inside you on the day you weigh. None of this is fat gained in a week. To put fat on, you would need to eat far more than you burn for a long stretch, and a few days cannot do that.
The NHS page on periods and the menstrual cycle explains that most cycles come around every 21 to 35 days. So your heavy days on the scales will not always fall on the same date of the calendar month.
A monthly diary instead of a daily verdict
Try this for 2 or 3 cycles. Weigh yourself in the morning, after the toilet and before breakfast. Note the date and the day of your cycle. Then compare day 5 of this cycle with day 5 of the last 1. The trend you see that way is honest, and the bad mornings stop feeling like failure.
- Day 1 of bleeding is day 1 of the cycle, the easiest marker to note.
- The week after your period is often the calmest time to read the scales.
- A tape measure at the waist gives a 2nd opinion that water moves less.
Cravings on a long shift
If you work shifts on the business parks off the M6 or the M61, the late afternoon slump can meet premenstrual cravings head on. Plan for it rather than fight it. Pack a proper lunch with protein and wholegrain bread, and keep a small snack ready, like a yoghurt or an apple with a few nuts. Our page of snack ideas that travel well has more.
Salty food makes the body keep extra water, so this is a good week to go easy on crisps and ready meals. Drinking enough also helps the bloating feel lighter. See our guide to water and hydration through the day.
Vitamin B6 on your plate
Vitamin B6 contributes to the regulation of hormonal activity. You find it in poultry, fish, oats, wholegrain cereals, peanuts and bananas. A varied diet usually covers your needs without anything extra.
Signs worth a chat with your GP
Most monthly swings are normal. Some changes are not, like very heavy bleeding, bloating that does not ease after your period, or cycles that suddenly change length. The NHS guide to heavy periods lists what counts as heavy, and its page on bloating explains when to get help. This article does not replace advice from your GP or another health professional.
A steady routine helps
Poor sleep before a period can also push appetite up, as our article on sleep and appetite explains. At the club on Walton Summit, members have breakfast together before work and coaches trained in nutrition follow them every day, which makes a monthly pattern much easier to spot. Your free assessment is a good moment to talk it through.
Your weight loss curve
Fill in your details and the curve updates instantly.
Going at the median rate, losing 8 kg would need roughly 11 weeks. Going at the slowest rate, roughly 4 months.
For weight that stays off, the figure usually quoted is 500 g to 1 kg each week. On the chart, this is the ideal band. Losing more than 1 kg a week, week after week, means the body burns muscle as well as fat. On the chart, this is the shaded band.
This projection is only a guide. Everyone’s path is different and outcomes differ between people. Everything is worked out on your own device, and nothing gets stored or transmitted. If you are over 65, check with your GP before anything else.
How this curve is calculated
The upper line of the band stands for 500 g each week, the slowest rate. The lower line stands for 1 kg each week, where risk begins.
Early weeks move quicker, largely through water loss, and then things settle down. From 40 onwards the median curve eases off bit by bit as metabolism winds down. Putting in equal effort, men tend to lose a touch faster than women.
As in real life, the curve includes short stalls lasting a few days and the odd small gain. It cannot forecast how your own path will go.
These tips are general guidance. A doctor’s opinion still comes first.
Further reading
Day-to-day support is explained in our programme for eating more healthily.