top of page

Nutrition for combat and weight-category athletes

Combat and weight-category sports ask athletes to train hard while competing within a weight limit. We help boxers, grapplers, martial artists, lightweight rowers and jockeys fuel properly and manage weight safely, with RED-S risk always in view.

At a glance

  • Shared challenge: Training load versus weight limits
  • Weigh-in timing: Varies from matside to day before
  • Nutrition focus: Adequate energy, gradual planning, safe recovery
  • Key risk: RED-S, dehydration and rapid weight loss


What weight-category sports share

Every sport on this page links competition eligibility to body weight. That creates pressure to reduce weight before competition, often while training intensively. Research on combat sports shows that rapid weight loss and dehydration carry real health and performance risks, and that planned, supervised approaches are safer. These sports are also recognised as higher risk for low energy availability and RED-S, with effects on bone, hormones, immunity, mood and performance.

The sports differ in how and when weight matters. Boxing, MMA and many martial arts weigh in hours or a day before competition. Judo and BJJ may involve same-day or matside weigh-ins, and tournament formats mean several contests in one day. Lightweight rowers face a crew and individual weight limit alongside a large endurance load. Jockeys must meet riding weights repeatedly across a long season, which makes chronic restriction a particular concern.


Nutrition priorities for weight-category athletes


Plan weight early and gradually

Rapid and acute weight-loss methods, including dehydration, carry health and performance risks. We help you choose a realistic category and manage it gradually. We do not support unsafe rapid weight loss or dehydration. [3]


Keep energy availability adequate

Weight-category sports are among those with higher RED-S risk. We screen for fatigue, recurrent injury, illness, menstrual changes and mood changes, and refer for medical assessment where needed. [2]


Fuel the training that matters

Sparring, randori, ergometer pieces and riding work need carbohydrate. Depending on the day, needs can range from 3–5 g/kg on light, skill-based days to 6–10 g/kg on long, hard ones; we personalise this. [1]


Protein to protect muscle

Protein of 1.2–2.0 g/kg/day, with about 0.3 g/kg after sessions and spread across the day, helps maintain muscle when energy intake is carefully managed. [1]


Hydration, not dehydration

A practical training aim is to avoid losing more than 2% of body mass through sweat. We discourage sweat suits, saunas and fluid restriction as weight-making tools. [1]


Support for food and weight worries

Constant weighing can affect how athletes feel about food. Our eating disorder nutrition specialist supports athletes with under-fuelling and disordered eating, alongside medical and psychological care where needed.


Competition-day structure for weight-category sports

  1. Competition week: If weight has been planned well, this week involves only small, supervised adjustments. Keep fluid and carbohydrate regular as training tapers. [3]
  2. After the weigh-in: Start rehydrating and refuelling with fluid, electrolytes and familiar carbohydrate, little and often, scaled to the time before competition.
  3. Before and between contests: Where time allows, eat a familiar meal 1–4 hours before competing, containing 1–4 g/kg of carbohydrate. Between bouts, matches or races, use small, easily digested snacks and fluid. [1]
  4. After competing: Have about 0.3 g/kg of high-quality protein with carbohydrate. When competing again within hours, 1.0–1.2 g/kg/h of carbohydrate over the first 4 hours supports glycogen recovery. [1]

General guidance from sports nutrition consensus statements. Your practitioner will tailor amounts to you.


Sports in this category


Boxing

Fight camps of sparring and roadwork with weigh-ins that shape fight week, so gradual weight planning and post-weigh-in refuelling are central.


MMA

Several disciplines trained daily and day-before weigh-ins, so fuelling high training loads without aggressive late cuts is the priority.


Judo

Tournament days with repeated contests, so competing near training weight and refuelling between rounds matter most.


Brazilian jiu-jitsu

Matside weigh-ins leave no recovery time, so division choice close to everyday weight is the safest approach.


Taekwondo

Fast, kick-based bouts in weight divisions, with nutrition supporting speed, repeated contests and safe weight management.


Kickboxing

Striking-heavy training with weigh-ins that vary by organisation, so we plan fuelling and weight around the specific event rules.


Wrestling

Very high training intensity and a long history of extreme cutting, so we focus on adequate fuelling and gradual, supervised weight management.


Lightweight rowing

An endurance training load within a weight limit, which makes carbohydrate adequacy and RED-S screening particularly important.


Horse racing (jockeys)

Riding weights met repeatedly across a long season, often with travel and early starts, so we focus on sustainable fuelling, bone health and avoiding chronic restriction.


What we help with

  • Making weight repeatedly without feeling drained
  • Cycles of cutting and regaining weight around competitions
  • Low energy, injuries or illness during heavy training
  • Missed or irregular periods, or low libido
  • Anxiety or preoccupation around food and the scales
  • Knowing how to refuel safely after weigh-in
  • Fuelling on the road with early starts and travel


Ongoing support, not one-off sessions

We do not work with athletes on a one-off basis. Sports nutrition works best when it adapts to your training, so we recommend an initial consultation followed by at least three follow-ups.


Sports in this group


Who you could work with


Book your consultation

Book an initial consultation or book a free discovery call to talk it through first. All consultations are online.


Explore more

See all the sports we work with, our RED-S nutrition support, or meet the team.


Frequently asked questions


Can you help me make weight safely?

Yes. We help you plan a realistic weight category early and reach it gradually, prioritising your health and performance. Research shows rapid weight loss and dehydration carry significant risks, so we do not support those methods, and we do not set target weights or body-fat figures.


Why are weight-category athletes at higher risk of RED-S?

Training hard while repeatedly restricting food to meet a weight limit can leave too little energy for normal body functions. The IOC recognises weight-category sports as higher risk. We screen for warning signs and work alongside medical professionals where needed.


Do you support jockeys and lightweight rowers?

Yes. Both groups train or work at high loads within strict weight limits, often across long seasons. We focus on sustainable fuelling, bone health and safe weight management rather than short-term restriction.


What if I am struggling with my relationship with food?

This is common in weight-category sports, and you do not need to manage it alone. Our eating disorder nutrition specialist and RED-S-specialist dietitians support athletes with under-fuelling and disordered eating, alongside psychological and medical care where indicated.


How many consultations will I need?

We do not work with athletes on a one-off basis, because safe weight management is built over a season or camp, not a single week. We recommend a minimum of three follow-up consultations after your initial online consultation.


Do you work with young combat athletes?

These pages are for adult athletes. Young athletes are supported through our paediatric team, who prioritise growth and adequate fuelling.


References

  1. Thomas DT, Erdman KA, Burke LM. Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance. J Acad Nutr Diet. 2016;116(3):501–528.
  2. Mountjoy M, et al. 2023 International Olympic Committee (IOC) consensus statement on Relative Energy Deficiency in Sport (REDs). Br J Sports Med. 2023;57(17):1073–1097.
  3. Reale R, Slater G, Burke LM. Acute-weight-loss strategies for combat sports and applications to Olympic success. Int J Sports Physiol Perform. 2017;12(2):142–151.
bottom of page