# Eating enough, and your periods > Why a period that goes quiet can mean your body needs more fuel Category: Nutrition · 4 min read · Written by the Splash team · Sources checked October 2026 URL: https://splash.care/learn/nutrition/eating-enough-periods ## Quick answer - Periods need fuel, and missing or very light periods can be a sign the body is short of energy. - It can affect anyone who bleeds, not only athletes. - Regular eating, including carbs, plus support is the way back. - See a GP after 3 missed periods, and sooner if you are worried. Running a [menstrual cycle](https://splash.care/learn/glossary/menstrual-cycle) takes energy. If you are not eating enough to cover everything your body does, including [exercise](https://splash.care/learn/period-care/exercise-on-period), growing and daily life, it can turn the cycle down to save energy. Doctors call this [Low energy availability](https://splash.care/learn/glossary#low-energy-availability). A period that gets lighter, later or goes missing can be an early sign. > This can happen to anyone who bleeds. It is not about willpower or blame. The NHS lists sudden weight loss and doing too much exercise as causes of missed periods, and it lists not getting your period as a sign of an eating disorder. Anyone can get an eating disorder, and most people recover with treatment. ## Signs to notice - Periods that get lighter, further apart or stop. The NHS says to [see a GP](https://splash.care/learn/conditions/talk-to-your-doctor) if you miss 3 periods in a row. - Feeling cold, tired or dizzy, or a racing heart or fainting. - Getting ill more often, or aches and injuries that will not settle. The IOC says low energy availability can affect immunity, bone health, mood and more. - Strict food rules, worry about eating, or exercise that feels like you cannot stop. ## What helps - Fix the cause. Experts say the heart of treatment is finding why the energy is low, then giving the body more fuel, less load, or both. - Eat regularly, and include carbohydrates. The IOC's 2023 statement points to low carbohydrate availability as part of the problem. - Tell someone: a GP, a parent or carer, a coach, a friend. You do not have to work it out alone. - Ask your GP about a registered dietitian. The BDA says you can be referred by your GP. **Myth:** Periods stopping is a normal part of being an athlete. **Fact:** It is common in some sports, but common does not mean healthy. The IOC treats it as a warning sign of low energy availability, and the NHS says to see a GP if you miss 3 periods in a row. ## Fasting, keto and very low-carb plans Social media loves these for "[hormone](https://splash.care/learn/cycle-basics/hormones-explained) health". There is very little research on how they affect periods. A 2022 review found so few human studies of fasting and reproductive hormones that it could not draw solid conclusions. If you try a big change in how you eat and your periods change or stop, take that as your cue to stop and talk to a GP. > **Splash says:** your period is feedback, not a prize. If it changes, log it and tell someone. A missing period is not something to be proud of. **Quick quiz:** Your periods stop after months of hard training and lighter meals. What is the best next step? 1. Assume it is normal for someone fit 2. Tell a GP, and eat more regularly 3. Wait a year and see Answer: Tell a GP, and eat more regularly. Periods stopping is a warning sign. The NHS says to see a GP after 3 missed periods in a row, and earlier if you are worried. ### When to see a doctor See a GP if you have missed 3 periods in a row, your periods have not started by 15, or you have any of the signs above. If food or exercise feels out of control, or you feel scared of eating, call the Beat helpline (England: 0808 801 0677, 3pm to 8pm on weekdays, or use their webchat). If you ever feel you cannot keep yourself safe, call 999 or go to A&E. You can also call Samaritans free on 116 123, any time. ## Sources 1. [NHS: Missed or late periods](https://www.nhs.uk/symptoms/missed-or-late-periods/) 2. [NHS: Eating disorders, overview](https://www.nhs.uk/mental-health/feelings-symptoms-behaviours/behaviours/eating-disorders/overview/) 3. [Mountjoy et al. (2023) IOC consensus statement on Relative Energy Deficiency in Sport (REDs), British Journal of Sports Medicine](https://pubmed.ncbi.nlm.nih.gov/37752011/) 4. [Torstveit et al. (2023) Prevention of Relative Energy Deficiency in Sport (REDs), British Journal of Sports Medicine](https://pubmed.ncbi.nlm.nih.gov/37752004/) 5. [Cienfuegos et al. (2022) Effect of intermittent fasting on reproductive hormone levels in females and males: a review of human trials, Nutrients](https://pmc.ncbi.nlm.nih.gov/articles/PMC9182756/) 6. [Beat: I need support now (eating disorder helpline)](https://www.beateatingdisorders.org.uk/get-information-and-support/get-help-for-myself/support-now/) This is general information, not medical advice. Splash can’t diagnose. If you’re worried, talk to a GP, pharmacist or sexual health clinic. In an emergency call 999 (UK) or 911 (US).