Nutrition for MMA fighters and Brazilian jiu-jitsu athletes

At a glance

• Energy demands: Isometric grappling plus explosive striking and scrambles
• Training load: Multiple disciplines, often several sessions daily
• Weigh-in: Day before (MMA) or matside (BJJ)
• Key risk: Low energy availability and rapid weight loss

What MMA and BJJ demand physically

Grappling relies on long periods of isometric gripping, pushing and pulling, punctuated by explosive scrambles, takedowns and submission attempts. MMA adds striking and the need to get back up from the floor repeatedly. The result is a high, sustained muscular workload with frequent bursts of near-maximal effort, which depletes muscle glycogen and makes recovery between rounds and between matches heavily dependent on fuelling.

Because the sport spans several disciplines, MMA athletes often train striking, wrestling, jiu-jitsu and strength and conditioning in the same day. BJJ athletes may roll most days of the week alongside strength work. Mat time adds up quickly, and appetite, work and family life rarely keep pace, so many grapplers undereat without realising. Long-term low energy availability affects recovery, injury risk, immunity, bone health and hormones.

Weigh-in rules are a major difference between the two. MMA bouts commonly follow a weigh-in the day before, which encourages aggressive cuts. In many BJJ tournaments you weigh in immediately before your first match, sometimes in your gi, leaving almost no time to recover, so dehydrating to make weight is especially risky. Tournament days can also involve several matches, plus the open division, across long and unpredictable schedules.

Nutrition priorities for MMA and BJJ athletes

Fuel the mat time

Hard sparring and rolling sessions run largely on carbohydrate. On long, high-intensity training days of 1–3 hours, evidence-based intakes are 6–10 g/kg/day; we personalise this to your schedule and goals. [1]

Compete close to your training weight

Rapid weight loss and dehydration impair health and performance, and planned, supervised approaches are safer. With matside weigh-ins in BJJ there is no time to recover from a cut. We do not support unsafe rapid weight loss or dehydration. [5]

Recover between sessions

When you train twice in a day, carbohydrate of 1.0–1.2 g/kg/h over the first 4 hours after the first session supports glycogen recovery for the second. [1]

Protein for repair and grip strength

Grappling and striking cause significant muscle damage. Intakes of 1.4–2.0 g/kg/day, in servings of 20–40 g every 3–4 hours, support repair through heavy training weeks. [2]

Screen for RED-S early

Weight-category sports carry higher risk of low energy availability. We look out for fatigue, recurrent injuries, illness, menstrual changes and mood changes, and refer for medical assessment where needed. [4]

Supplements and drug testing

Professional MMA athletes may be subject to anti-doping testing. Supplements carry contamination risk, so we recommend batch-tested products such as Informed Sport. [3]

Fight and tournament-day fuelling

1. Fight or tournament week: Taper training and keep meals regular and carbohydrate-based. If you are already close to your division, there is no need for drastic restriction; we do not support sweating or dehydrating to make weight. [5]
2. Before you compete: For an MMA bout, refuel and rehydrate after the weigh-in, then eat a familiar meal with 1–4 g/kg of carbohydrate 1–4 hours before the fight. For a matside BJJ weigh-in, eat a planned, lighter breakfast so you weigh in comfortably and can still compete fuelled. [1]
3. Between matches: On a BJJ bracket day, use small, easily digested carbohydrate snacks and fluid between matches, scaled to how long you have before you are called. Pack enough food for a long, unpredictable day.
4. After competing: Have a meal or shake providing about 0.3 g/kg of high-quality protein with carbohydrate. If you are entering the open division or competing again tomorrow, prioritise carbohydrate in the first few hours. [1]

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

Formats and athletes we support

Professional MMA

Full fight camps with day-before weigh-ins. We plan the weight class early and build a post-weigh-in refuelling plan, rather than relying on large late cuts.

Amateur MMA

Often training around full-time work, with less support staff. Practical meal planning and safe division choices are the priorities.

BJJ gi and no-gi tournaments

Matside weigh-ins, multiple matches and long days. Competing near your natural weight and packing the right snacks matter most.

Masters grapplers

Training consistently around careers and family, with recovery becoming more important. Protein distribution and joint-friendly recovery habits are common focuses.

What we help with

• Gassing out late in rounds or later matches
• Making weight without dehydration or crash dieting
• Eating enough to support several sessions a day
• Not knowing what to eat on a long tournament day
• Recurrent injuries, illness or fatigue during camp
• Difficult relationship with food, weight or the scales
• Choosing supplements that are safe for anti-doping testing

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.

Who you could work with

• Jenaed Ruddock, HCPC-registered Sports Dietitian (SENr)
• Melissa Bosch, Eating Disorder Nutrition Specialist
• Beatriz Ribeiro, HCPC-registered Dietitian
• Tom Hill, SENr Sports and Performance Nutritionist

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

How do I make weight for a BJJ tournament with a matside weigh-in?

Because you weigh in just before your first match, there is effectively no recovery time, so choosing a division close to your normal training weight is the safest route. Dehydrating to make weight is risky to your health and performance, and we do not support it. We help you plan a realistic division and a pre-weigh-in breakfast.

Is weight cutting safe in MMA?

Research on combat sports shows that rapid weight loss and dehydration carry health and performance risks, and that planned, supervised approaches are safer. We do not support unsafe rapid weight loss or dehydration. We help you choose a sensible weight class and manage it gradually through camp, with no target weights.

What should I eat between matches at a jiu-jitsu competition?

Small portions of familiar, easily digested carbohydrate, such as bananas, rice cakes, sandwiches or sports drinks, plus regular fluid usually work well. The right amount depends on how long you have before your next call, and we build this into your tournament plan.

Can MMA and BJJ athletes get RED-S?

Yes. Weight-category sports and high training loads both increase the risk of low energy availability. Our dietitians and our eating disorder nutrition specialist support fighters with RED-S, chronic under-fuelling and disordered eating, alongside medical input where needed.

Can you just help me with fight week?

We do not work with athletes on a one-off basis, because safe weight management and fuelling for multi-discipline training need time to build and adjust. We recommend a minimum of three follow-up consultations after your initial consultation, ideally spread across your camp. All consultations are online.

Do you work with young grapplers and fighters?

This page is for adult athletes. Young grapplers are supported through our paediatric team, who focus on growth, development 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. Jäger R, et al. International Society of Sports Nutrition Position Stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20.
3. Maughan RJ, et al. IOC consensus statement: dietary supplements and the high-performance athlete. Br J Sports Med. 2018;52(7):439–455.
4. 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.
5. 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.