Eat Enough, Sleep Enough, Don't Rush to Cut Weight: Nutrition, RED-S and Recovery for Climbers

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You've started hangboarding three times a week. A friend at the gym says, "Drop two kilos and you'll send that route." You start skipping dinner. The first two weeks feel easier. By week four your fingers never seem to recover and the loads on the board won't go up.

This post answers two questions. Is "lighter means stronger" actually true? And how do you know you're training too much or eating too little? It's the last post in the Climbing Training series. The plans in earlier posts (hangboard, periodization) all assume you eat and sleep enough. This post is about that assumption.

To be clear about scope: this is a summary of what research and coaches say, not a diagnostic tool. If the warning signs below match your situation, see a doctor or registered dietitian rather than judging yourself by the numbers.

Evidence labels in this post: research = published studies; coaching consensus = advice from coaches or training organizations, not directly tested in studies.

"Lighter means stronger": the views side by side

Half of this is true. Climbing works against gravity, so for the same finger strength, less body weight means less load on each finger. But "eat less now and you'll climb better" is a different claim.

Read the table this way: top climbers are leaner on average. That's a fact. But leanness is one of the outcomes, which doesn't mean cutting weight will make you stronger. Lattice puts it bluntly: long-term calorie deficits will not help strength.

Rodden's story is worth reading in full. Her first ascent of Meltdown was the hardest trad route established by a woman at the time. She started losing weight before competitions as a teenager and didn't get her first period until 19. She writes that losing weight "worked really well for my short-term performance gains but was extremely harmful in the long run": in her late twenties, tendons, ligaments and bones began to fail.

Something you can do tonight: Think of the last time you thought "if I were just a bit lighter." Which route, which move? Was it really weight, or footholds, body position or fingers? Go back to the Climbing Movement overview and look at that move as a technique problem first.

What RED-S is

Relative Energy Deficiency in Sport (RED-S) is a term the International Olympic Committee introduced in 2014; the 2023 consensus statement updated it as REDs. The cause is low energy availability (LEA): the energy you eat, minus what exercise burns, leaves too little for the body to run normally.

Sports medicine physician Dr. M's summary (in Chinese) explains it clearly. RED-S grew out of the Female Athlete Triad; once it became clear that men are affected too, it got a broader name. The systems involved include menstrual function, bone, hormones, metabolism, immunity, digestion and mental health.

Two common misunderstandings:

1. "My BMI is normal, so I'm fine." Joubert 2022 surveyed World Cup-level female competitors and found some with menstrual disturbances despite relatively normal BMIs. World Climbing (formerly the IFSC) also says a BMI test alone does not give an accurate picture of health. (Research)
2. "This is a women's problem." The 2023 IOC consensus notes that more data now describe the impact of LEA in males. (Research)

Something you can do tonight: On one sheet of paper, write down this week's training days and the days you deliberately ate less. If they fall on the same days, drop one of the two.

Three groups of warning signs

Lattice's RED-S article splits the warning signs into menstrual and non-menstrual. Grouped into three, they're easier to remember:

1. Menstrual changes: cycles become irregular, flow or cycle length changes, or periods stop. With low energy availability, the body turns down sex hormone production. Two caveats: the bleed on the combined oral contraceptive pill isn't a natural cycle and can mask a problem; and some athletes have had multiple stress fractures before their period changed, so a regular period doesn't mean you're healthy. (Coaching consensus)
2. Repeated injury or illness: Lattice lists both. Grønhaug 2026 surveyed 417 climbers and found that a higher LEA symptom burden went with higher odds of reporting a current injury, with gastrointestinal symptoms the most consistent link. It's a cross-sectional study, so it shows an association, not that LEA causes injury. (Research)
3. Training stops paying off; mood and focus drop: poor response to strength training, reduced concentration, low mood, low motivation. This group applies to everyone, menstrual cycle or not. (Coaching consensus)

Lattice's suggestion: if you notice these changes, try reducing training, adding more frequent rest weeks, or eating a bit more. A change in your period should always be checked by a doctor first to rule out other medical conditions.

Something you can do tonight: Start a note on your phone with one line per week: period (if you have one), whether you were ill or injured, and whether your hangboard load dropped from last week. Keep it for four weeks and bring it to the doctor.

Do climbers really under-eat?

If you think "but I'm not dieting," the research may surprise you. Many climbers who aren't deliberately restricting still don't eat enough.

• Monedero 2023: of 25 advanced to elite climbers, 28% had LEA. Average carbohydrate intake in both the male and female groups was below sports nutrition recommendations, and calcium, magnesium and vitamin D intakes were inadequate. (Research)
• Gibson-Smith 2020: most of 40 experienced climbers didn't eat enough to meet the predicted needs of a "moderate" training program. 30% of the women met the criteria for iron deficiency. (Research)
• Mora-Fernandez 2024: more than half of 46 Spanish sport climbers had inadequate carbohydrate intake. (Research)
• The narrative review by Tan and Schöffl 2025 also notes a concerning number of high-level climbers whose nutrition can't sustain even a moderate level of training. (Research)

So how much should you eat? Honestly, there's no climbing-specific answer. Joubert 2026 reviewed 16 observational studies of climbers' diets and found that no clinical trial has yet manipulated climbers' diets, so evidence-based, climbing-specific nutrition guidance doesn't exist yet.

The most concrete guidance so far comes from Smith 2017's review of bouldering nutrition: bouldering is high-intensity, so make sure carbohydrate is adequate; spread protein across the day, roughly every 3–4 hours; and when weight loss is the goal, it's even more important to work with a nutrition professional. The same review says every aspect of bouldering nutrition still needs more research. (Research review)

Something you can do tonight: Take photos of your three meals tomorrow, a training day. If there's almost no rice, noodles, potatoes or similar starch, you're in the gap the studies find most often (low carbohydrate). Show the photos to a registered dietitian and ask them to work out how much you need for your training load. If you want to change your weight, book the dietitian first.

Disordered eating: why two studies seem to disagree

How common is disordered eating in climbing? Two studies seem to give different answers:

They don't actually conflict. Joubert had no control group, so it can only say the problem exists among climbers. Nigicser had one and found climbers were no worse than non-climbers. Both found higher risk in women than in men.

Grønhaug 2023 analysed injuries in the same group of World Cup women: BMI did not predict injury, and those with an eating disorder appeared more likely to be injured, though this did not reach statistical significance. (Research)

If thoughts about food or weight are already affecting your daily life, that is a medical issue. See a psychiatrist or psychologist; it isn't something to push through on willpower.

How World Climbing handles REDs

World Climbing introduced a REDs policy in 2024 and describes itself as the first international federation with comprehensive REDs regulations. The four main parts:

• Athletes fill in two short questionnaires (height, weight, heart rate, blood pressure and so on).
• National federations issue each athlete a health certificate, or request more testing before giving clearance.
• Random and targeted testing of BMI, heart rate and blood pressure during the season.
• Suspected cases go to an external commission of independent experts.

They deliberately don't screen on BMI alone. Their reasons: BMI by itself isn't accurate, it varies a lot between countries, and excluding athletes on BMI alone wouldn't be legally defensible. For everyday climbers the takeaway is simple: if the international federation doesn't rely on a weight number, you don't need to make it your only measure either.

Something you can do tonight: If you coach or lead a team, check whether you've commented on anyone's weight in front of athletes this week. The BMC-supported En:Spire event brought a sports medicine doctor and a dietitian to a climbing wall to talk about RED-S signs and management, partly so coaches and clubs could better support their athletes.

Recovery: how do you know you've overdone it?

Eating enough is half of it. The other half is giving your body time to recover.

How long between hangboard sessions: In her Fingerboard Training Guide III, Eva López recommends two sessions a week for improvement, with 48–72 hours of recovery between them; even if you do three sessions a week, that gap is still "compulsory." (Coaching consensus)

She also lists when to extend the gap to 72 hours: high stress, a physically demanding job, or when you can't reach the same load from one session to the next without an obvious reason. In that case she says to review the rest of your week's climbing and training, plus your diet and sleep.

What happens when load exceeds recovery: Physical therapist Jason Hooper of Hooper's Beta says tissues have a limited capacity for work. Too much workload exceeds your ability to recover and leads to chronic fatigue and eventually the failure of some tissue, often in the fingers or shoulders. He also notes that adults generally need much more recovery time than youth team kids. (Coaching consensus, physical therapist's view)

How to deload: Lattice's deload article says they run 3–4 week cycles, each ending with a deload week. A deload isn't a week off; it cuts total training load by 40–60%: fewer sessions, fewer sets, or easier climbing. During a deload, avoid staying up late or eating less well, because both affect recovery. (Coaching consensus)

Putting these together gives three possible signs of overdoing it:

1. Your hangboard load falls short of last session's twice in a row, with no obvious reason.
2. Your second session of the week is regularly worse than the first.
3. Repeated minor injuries, frequent colds, low mood and motivation. These overlap with the RED-S warning signs; Lattice reads them as signs of too much stress and too little food or recovery.

These come from coaching advice, not diagnostic criteria. If pain persists or gets worse, see a physical therapist or orthopaedic doctor. Injury prevention and what to do after an injury are covered in the Climbing Injuries and First Aid series.

Something you can do tonight: Add a column to your training log: "this session's hangboard load vs last time." Next time it drops, don't add extra training. Check the previous two nights' sleep and food, and push the next session back to 72 hours later.

Practice: four scenarios

1. A friend says you'd send that 5.11b if you lost two kilos. You've been climbing for a year and a half and aren't overweight.

2. Your BMI is in the normal range, you've missed two periods, and your hangboard loads aren't going up.

3. You're a man. You've had four colds in three months, your fingers and shoulders take turns aching, and you have no motivation to train.

4. You hangboarded three times this week. The third session's load was well below the first, and you slept five hours the night before.

Next steps

This is the last post in the Climbing Training series. Looking back over the series: use the overview to work out where you're stuck, pick from hangboarding, endurance or antagonists and core to fill the gap, then fit it into a year with periodization. Eating and sleeping, covered here, are the foundation under every one of those plans.

Injury prevention and what to do after an injury are covered in the Climbing Injuries and First Aid series.

References

• Mountjoy M et al. 2023 International Olympic Committee's (IOC) consensus statement on Relative Energy Deficiency in Sport (REDs). Br J Sports Med 2023
• Tan K, Schöffl V. Relative Energy Deficiency in Sport in Rock Climbers: A Narrative Review. J Strength Cond Res 2025
• Monedero J et al. Dietary Intakes and the Risk of Low Energy Availability in Male and Female Advanced and Elite Rock Climbers. J Strength Cond Res 2023
• Mora-Fernandez A et al. Nutritional Assessment, Body Composition, and Low Energy Availability in Sport Climbing Athletes. Nutrients 2024
• Gibson-Smith E et al. Dietary Intake, Body Composition and Iron Status in Experienced and Elite Climbers. Front Nutr 2020
• Joubert L et al. Nutrition prescription for climbing athletes on rock or artificial surfaces: are we guessing? Front Sports Act Living 2026
• Smith EJ et al. Nutritional Considerations for Bouldering. Int J Sport Nutr Exerc Metab 2017
• Joubert LM et al. Prevalence of Disordered Eating Among International Sport Lead Rock Climbers. Front Sports Act Living 2020
• Joubert L et al. Prevalence of amenorrhea in elite female competitive climbers. Front Sports Act Living 2022
• Nigicser I et al. Do Swedish rock-climbers exhibit more eating disorder and body dissatisfaction symptoms than non-climbers? BMJ Open 2024
• Grønhaug G et al. Top of the podium, at what cost? Injuries in female international elite climbers. Front Sports Act Living 2023
• Grønhaug G et al. Underfueled and overloaded: association between low energy availability symptoms and current self-reported injury status in climbers. Front Sports Act Living 2026
• Watts PB et al. Anthropometric profiles of elite male and female competitive sport rock climbers. J Sports Sci 1993
• Ginszt M et al. Body Composition, Anthropometric Parameters, and Strength-Endurance Characteristics of Sport Climbers: A Systematic Review. J Strength Cond Res 2023
• Your Period Is A Marker of Health: RED-S & Energy Availability (Lattice Training, 2023)
• Lattice Training Series Part 5: Finger Strength Rules (UKClimbing)
• Do Climbers Need Deload Weeks? (Lattice Training, 2026)
• Fingerboard Training Guide III (Eva López, 2018)
• Throw Your Hangboard in the Trash If You Don't Know This (Hooper's Beta)
• New competition policy places IFSC at forefront of fight against REDs (World Climbing, 2024)
• Climbing's Send-at-All-Costs Culture Almost Ruined Me (Beth Rodden, Outside, 2020)
• En:Spire: raising awareness of Relative Energy Deficiency in climbing (UKClimbing)
• Relative Energy Deficiency in Sport (RED-S) (Dr. M Be Superior, 2020) (in Chinese)

Update Log

• 2026-10-18: The Climbing Injuries and First Aid series is now published; replaced "in progress" mentions with links.