You show up to every class, even when you’re tired. You push through sparring rounds that test everything you have. But if your nutrition isn’t keeping pace with the demands you’re placing on your body, you’ll always perform below the level you’re capable of.

This article is the written version of a talk I gave recently at Rise Above Martial Arts, and I hope it leaves you with some key takeaways you can apply to your training routine, even if you weren’t able to make it. 

I’m Max Snider, Registered Dietitian and Personal Trainer based in Sudbury, Ontario. I work with athletes and everyday clients virtually across all of Ontario. I’ve spent years helping people understand that food isn’t just about what you look like. It’s about how you feel and what your body can actually do. That lens is everything in this guide.

Whether you’re a recreational martial artist, a competitive fighter navigating weight classes, a parent of a young athlete, or a coach looking for reliable guidance to share, this is for you.

Why Martial Arts Make Unique Demands on Your Nutrition

Martial arts; whether that’s Kuk Sool Hap Kido, Brazilian Jiu-Jitsu, Judo, Wrestling, Muay Thai, Karate, Tae Kwon Do, or MMA, aren’t like most sports. They combine explosive power, sustained endurance, precision skill, and mental sharpness all at the same time. That combination creates nutritional demands that generic healthy eating advice simply doesn’t address, in addition to weight classifications.

The caloric needs of combat sport athletes training at moderate to high intensity can reach 40 to 70 calories per kilogram of body weight per day. This is significantly higher than what the average person needs for a day. In practice this means someone engaging in martial arts will need about 3000-4000 calories per day, which is like eating 3 large pizzas a day.

But it’s not just about calories. The type, timing, and distribution of nutrients across the day all influence how well you train, how quickly you recover, and how sharp you are when it counts. Getting this right doesn’t require a complicated system. It just requires understanding a few key principles and applying them consistently.

Macronutrients for Martial Artists: What the Research Actually Says

Carbohydrates: Your Primary Fuel

Carbohydrates are stored as glycogen in your muscles and liver. When training intensity increases, glycogen is your body’s fuel of choice because it’s easy to use. When glycogen runs low, performance suffers: power drops, reaction time slows, and the mental clarity required for technique and strategy fades.

The research on combat sport athletes recommends carbohydrate intake in the range of 4 to 10 grams per kilogram of body weight per day, with the higher end appropriate for high-volume or high-intensity training phases. For youth athletes specifically, a 2025 review published in the journal Nutrients found daily carbohydrate needs of 6 to 10 grams per kilogram. This means an athlete’s plate should be focused on carbohydrates and look something like this.

Protein: Building and Protecting Lean Tissue

Protein is essential for repairing the muscle damage that occurs during training. Protein recommendations for combat sport athletes are about 1.2 to 2.0 grams per kilogram of body weight per day. 

When you get this, protein doesn’t particularly matter, what’s important is that you enough enough protein every day. This can be across 3 meals or 5; it won’t make much of a difference in your performance. But if you need a lot of calories, getting them in more frequent and smaller meals may be beneficial. 

Good whole food protein sources include eggs, Greek yogurt, cottage cheese, chicken, turkey, fish, lean beef, lentils, chickpeas, edamame, tofu, and tempeh. A protein source at every meal is a simple, effective habit.

Dietary Fat: Not the Enemy

Fat plays essential roles in hormonal health, absorption of fat-soluble vitamins (A, D, E, and K), and sustained energy during lower-intensity work. Quality fat sources like avocado, olive oil, nuts, seeds, and fatty fish also carry anti-inflammatory properties that support recovery from the physical demands of hard training. The research supports that fat comprising roughly 20 to 35% of total daily calories for athletes is appropriate. Generally, you get enough fat in your diet without intentionally adding it, so for most people, tracking this isn’t helpful. 

Nutrient Timing: Before, During, and After Training

When you eat matters. For martial artists who often train in the evenings after work or school, this is particularly important to get right.

Before Training

Aim to eat a balanced meal containing carbohydrates, moderate protein, and lower fat and fibre two to three hours before training. High-fat and high-fibre meals slow digestion and can cause discomfort when you’re training. Think: rice with chicken and vegetables, oats with milk and fruit, or whole-grain toast with eggs.

If training is 60 to 90 minutes away, a smaller carbohydrate-focused snack works better: granola bars, apple sauce, fig bars, dried fruit, bananas, or rice cakes with honey are my favourite options. The goal is to arrive at training with the energy you got from your carbs so you can train harder for longer.

During Training

For sessions under 60 to 75 minutes, water is typically sufficient. For longer, higher-intensity sessions, particularly during tournament days or extended training camps, consuming 30 to 60 grams of carbohydrate per hour during training helps maintain intensity and delay fatigue. Fruit, rice cakes, or a small carbohydrate-rich snack between rounds or during breaks can serve this purpose without requiring commercial sports products. But sports drinks can also be a great tool for hydration and carbohydrate intake during exercise. 

After Training

The post-training window is a great opportunity to refuel your body and help it repair. Research consistently supports consuming both protein (20 to 40 grams, depending on body size and training intensity) and carbohydrates (1 to 1.2 grams per kilogram) within 30 to 60 minutes. Chocolate milk, Greek yogurt with fruit and granola, a protein smoothie with banana, or a proper meal if your schedule allows.

Want a personalized nutrition plan built around your training? That’s exactly what I do. 

Book a free call with Max →

Hydration: The Performance Variable Everyone Under Estimates

Dehydration degrades performance faster than almost any other nutritional variable. Research shows that losing even 1 to 2% of body weight in fluid measurably impairs reaction time, power output, decision-making, and endurance. Meaning that hydration is very important for martial artists.

Daily Hydration

A practical baseline: approximately half your body weight in pounds as ounces of water daily. A 150-pound athlete targets roughly 75 ounces (just over two litres). Needs will increase if training is frequent or if training in hot environments.

Around Training

Arrive at training already hydrated. Sip consistently through the day rather than flooding your system right before class. The Canadian Paediatric Society recommends that youth athletes drink 13 mL of fluid per kilogram of body weight during exercise as a minimal guideline. Adults can estimate fluid losses by weighing before and after training or by tracking their fluid intake and making sure their urine is pale yellow most of the time. If it’s dark, you need more water. 

Electrolytes: When They Matter

For sessions under 60 minutes, water is sufficient for most athletes. For longer sessions, hot environments, or multi-match tournament days, electrolytes become important for maintaining fluid balance and preventing cramping. Whole foods (fruits, vegetables, a pinch of salt in water) are often adequate. Purpose-built sports drinks are useful and make for a convenient option but are not usually necessary. 

Nutrition for Youth Martial Artists: Growing Bodies Need More, Not Less

Youth martial artists are not small adults. They are growing humans whose energy demands exceed what most coaches, parents, and even the athletes themselves recognize.

A 2025 systematic review in the journal, Nutrients confirmed what practitioners have long observed: most current sports nutrition guidelines are based on adult populations, and there are significant gaps in research on adolescent athletes specifically. What we do know is that growth requires energy on top of training energy, and that underfueling is one of the most common and most consequential mistakes young athletes make.

The Reality of Underfueling in Youth Athletes

When a young athlete doesn’t consume enough energy to support both training and growth, the body makes difficult trade-offs. Growth and development take priority, which means training adaptation and recovery suffer first. But sustained underfueling doesn’t spare growth either. It can eventually impairs bone density development, hormonal function, immune health, and the psychological relationship with food and body. This is not common, but something to be aware of.

Three solid meals plus targeted snacks before and after training is a realistic minimum. Skipping breakfast before school, training in the evening, and eating a light dinner is a common pattern in youth athletes. It’s one that virtually guarantees a performance and recovery deficit. Kids are resilient, but we want to do our best to make sure they fuel themselves well.

Language and Culture Matter: A Note for Coaches and Parents

Adults in a youth athlete’s environment have enormous influence over how that athlete relates to food and their body. Comments about weight (even well-intentioned ones) can leave lasting marks. In martial arts, where weight classes create objective pressure around body size, this influence is amplified. In kids, this pressure can lead to disordered eating behaviours and poor body image, which carry over to adulthood and add significant stress to their lives.

The research on athletic performance consistently supports performance-centred nutrition conversations with young athletes: what foods give you energy, how food helps your body recover, and what you need to show up at your best. Not what the scale says.

So when it comes to weight classes, it’s important to maintain neutral language. When talking about food, it’s important to talk about what food does for us. For example, when talking about protein, highlight that it’s important for big muscles. When talking about sweets and snacks, highlight that they are great energy but don’t support muscles, and your body needs both. You can share the same messages around food without mentioning weight. If you don’t have the knowledge base to do this, that’s okay. It’s not something most people are taught. I would recommend parents or coaches who don’t feel confident talking about food in the context of sports to consult with a dietitian who can have this conversation.

Weight Classes and Performance: Understanding Your Ceiling

If you compete in a weight-class sport, this section is for you. I want to approach it from a direction that’s different from most of what you’ll read online. Most of what’s written about weight classes focuses on how to weigh less. The more useful question is, where do you perform best?

What Weight Classes Are Actually For

Weight categories in martial arts exist to level the competitive field to match athletes of similar size, strength, and power against each other. The goal is fair competition and the safety of competitors. But the way weight classes are used in practice often drifts from that intent, with athletes cutting significant amounts of weight to compete in a lower category in hopes of having a size advantage after rehydrating.

The research on this practice is consistently cautionary. The ISSN’s (International Society of Sports Nutrition) 2025 position stand on combat sports nutrition noted that weight loss strategies like dehydration have measurable negative effects on strength, power, endurance, and cognitive performance.

Your Performance Ceiling

Every athlete has a weight at which their strength, speed, endurance, and recovery are all naturally optimized. This happens when they are well-fueled, well-trained, and maintaining a healthy competition weight. Competing at or near that weight, in the corresponding weight class, is where performance peaks. Competing significantly below it, after aggressive cutting, means showing up depleted against an opponent who may naturally live at that weight with all their performance intact.

The athletes who perform most consistently over a long competitive career tend to be those who maintain stable, well-fueled body weight year-round, making modest, planned adjustments in the weeks before competition rather than dramatic last-minute cuts that compromise training and recovery in the process. Weight cutting can become necessary at the highest level of sport in adult age brackets, but until then, I do not think it’s something anyone should worry about.

Choosing the Right Class

If you’re unsure whether your current weight class is the right one, a few honest questions are worth sitting with. Do you feel strong, energized, and recovered at competition weight? Or depleted, flat, and slower than you are in training? Are you enjoying the sport, or does the build-up to competition feel like punishment? Is your performance in competition matching your performance in the gym?

Moving up a weight class is not a defeat. For many athletes, it is a performance breakthrough competing as a full, well-fueled version of themselves against opponents of similar natural size.

Why Working With a Registered Dietitian Makes a Difference

Most martial artists get their nutrition information from coaches, training partners, YouTube, and social media. Some of that information is genuinely useful. A significant amount of it isn’t, and without professional training to evaluate it, it’s difficult to know which is which. This is especially true in a sport where nutrition advice often comes wrapped in personal anecdotes and competitive outcomes that may not reflect the underlying cause.

A Registered Dietitian (RD) is a regulated health professional. In Ontario, Dietitian’s are regulated by the College of Dietitian’s of Ontario, which means defined education standards, ongoing professional development requirements, and accountability that an unregulated nutritionist, personal trainer, or online coach simply does not carry. Not all nutrition advice is equal, and that difference matters more when the stakes include a young athlete’s development or a competitor’s long-term health.

What It Actually Looks Like

Working with an RD for athletic performance isn’t about receiving a generic meal plan. A good assessment looks at your training schedule and load, your current eating patterns and where the gaps are, your goals, your competition calendar, and any health considerations specific to you.

The Ontario Benefits Angle Most Athletes Don’t Know

Here’s something that surprises most of my clients: Registered Dietitian services are covered by most Ontario extended health benefit plans. If you or your family have employee benefits through work, a parent’s employer, or a union plan, there’s a real possibility that working with an RD costs you nothing out of pocket, or very close to it. This is true whether you’re working with me in person in Sudbury or virtually from anywhere in Ontario.

It’s worth checking your plan before assuming cost is a barrier. Many people are genuinely surprised by what their benefits cover.

The Bottom Line

Martial arts demand a lot from your body. The athletes who perform most consistently treat nutrition as part of their training, not separate from it. They prioritize eating well over weight classes and beat their competition because of it. 

The research is consistent across all demographics. Adequate energy intake, quality carbohydrates, enough protein, good hydration, and attention to key micronutrients are not performance extras. They are the foundation that everything else is built on.

You don’t need a complicated system. You need consistent habits grounded in evidence. 

The easiest way to get started on your own is to implement the plate model and have a structured fueling routine around exercise as described above.