Water Polo Nutrition and Supplements: Fuel, RED-S and What Works

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Practice ends at 8 p.m. and the team piles into the parking lot starving, the kind of hungry only two hours of eggbeater and counterattacks can produce. Someone has a bag of chips; someone else has a turkey sandwich and a chocolate milk. A water polo body is big and muscular, it works hard in the water, and it needs real food to keep going through doubles, lifting and weekend tournaments. This page covers water polo nutrition for every level, from youth and high school players to college, masters and national-team athletes: how much energy players need, what to eat around practice, the warning signs of not eating enough, and which supplements are worth a look, with third-party testing as the rule.

General information, not medical or dietary advice. A registered sports dietitian can build a plan for you. Back to the water polo hub.

What makes water polo different

Water polo players are swimmers built like wrestlers. In a 2024 study comparing elite players with elite swimmers from the same country, the water polo players were taller and heavier, with more muscle. They also ate less: about 39 calories and 4.4 grams of carbohydrate per kilogram of body weight per day, against about 60 calories and 7.8 grams for the swimmers. The authors said the two sports need different nutrition plans. Another 2025 study of water polo players over a competitive period found their protein intake was adequate but their carbohydrate intake was low. For a sport that runs on repeated sprints, that’s the gap most players need to close first.

Daily eating: carbohydrate, protein and timing

A 2014 expert review of nutrition for aquatic athletes suggested daily carbohydrate of about 3 to 10 grams per kilogram of body weight, scaled to how much and how hard you train, and about 0.3 grams of high-quality protein per kilogram right after key sessions and at regular times through the day. For a 75 kg (165 lb) player, that’s roughly 20 to 25 grams of protein in a meal or snack, several times a day. In practice:

• Every meal: a carbohydrate base (rice, pasta, potatoes, bread, oats, fruit), a protein (chicken, fish, eggs, beans, Greek yogurt, milk) and some vegetables.
• Before morning practice: something small and quick (a banana, toast with honey, a glass of milk) rather than nothing.
• After practice: a snack with carbohydrate and protein in the bag, like chocolate milk, a sandwich or a yogurt, then a full meal.
• Hard days and tournaments: more carbohydrate, more often. See our water polo game day page for between-games eating.
• Off-season or injured: eat to match the lower training load, the same review advised, but don’t diet hard; rapid weight swings work against you.

Hydration counts too: elite players lost about 786 mL of sweat an hour in games and drank about half that. Keep a bottle at the pool for every practice.

Not eating enough: RED-S

The International Olympic Committee’s 2023 consensus statement describes Relative Energy Deficiency in Sport (REDs): when athletes, female or male, don’t eat enough for their training, the body cuts back on hormones, bone health, immunity, energy and mood, and performance and injury risk suffer. The IOC review found signs of low energy availability in roughly 23 to 80% of female athletes and 15 to 70% of male athletes across the studies it looked at. Signs to take seriously:

• Missed or stopped periods, or no period by age 15.
• Stress fractures or bone injuries from little trauma.
• Frequent illness, constant tiredness, poor sleep, low mood or anxiety.
• In males, low sex drive or loss of morning erections.
• Getting slower or weaker despite training hard, or worry about food and weight.

If any of these sound familiar, talk to a doctor, ideally one who works with athletes. The IOC recommends that body-fat testing in athletes under 18 be done only for medical reasons. Coaches and parents: comments about weight do harm; talk about fuel for performance instead.

Supplements: what’s worth a look

Food first, every expert group agrees, and the 2014 aquatic review said supplements should only be used with guidance from trained professionals. A 2025 systematic review of supplements and recovery in water polo found small studies suggesting possible benefits from things like whey protein, beta-alanine and others, but stressed that any supplement should be evaluated with a health professional or sports nutritionist, and some of what’s been tested (spirulina, copper) rests on very little evidence. Here’s where the stronger evidence sits:

• Protein powder: convenience, not magic. Useful when a real meal is hours away after late practice. It doesn’t do anything food can’t.
• Electrolytes and sports drinks: helpful on long, hot tournament days and two-a-days, less so for a single practice.
• Creatine and caffeine: some of the stronger evidence, for adults. Expert groups place both among the better-studied performance supplements, and creatine is one of the most studied supplements of all for repeated sprints and strength work. Creatine can add body weight. Caffeine isn’t for everyone: side effects include anxiety, upset stomach, poor sleep and a racing heart, so check with a doctor if you have a heart condition, are pregnant or are sensitive to it. Stay within the label.
• Iron and vitamin D: get tested before supplementing. Expert groups warn that routine iron supplements without a need can do more harm than good.
• Young players: the American Academy of Pediatrics says caffeinated energy drinks have no place in children’s and teens’ diets and advises against creatine for young athletes. For a teen player the “supplements” that matter are breakfast, a packed snack and a water bottle.

Third-party testing matters

Supplements aren’t checked before sale the way medicines are. In one study of 634 supplements, about 15% contained steroid-like substances not on the label. Athletes are responsible for anything in their body, and college, national-team and Olympic players can be drug-tested. Look for NSF Certified for Sport or Informed Sport / Informed Choice. These lower the risk of contamination but don’t prove a product works. Avoid anything with a “proprietary blend”, and anything banned in sport.

Our picks for water polo players

Product	In one serving	Certification	About (Oct 2026)	Per serving
Thorne Whey Protein Isolate	21 g protein	NSF Certified for Sport	$65 / 30 scoops	about $2.17
Skratch Labs Hydration	400 mg sodium, 19 g carbs	Maker says NSF Certified for Sport (not found in NSF’s database in Oct 2026)	$24 / 20 servings	about $1.20
Nuun Sport	300 mg sodium, 150 mg potassium, 1 g sugar	Informed Choice (per Nuun)	$7.49 / 10 tablets	about $0.75
Thorne Creatine	5 g creatine monohydrate	NSF Certified for Sport	$44 / 90 scoops	about $0.49
Klean Multivitamin	2 tablets; 1,000 IU vitamin D	NSF Certified for Sport	about $46 / 30 servings	about $1.53

Why these five: Thorne Whey is a simple 21 g protein shake for after a late practice or lifting session. Skratch Labs Hydration adds carbohydrate to the electrolytes, so it doubles as fuel on tournament days; its maker says it’s NSF Certified for Sport, but we couldn’t find it in NSF’s search, so check before relying on it. Nuun Sport is the cheap, low-sugar tablet for the pool bag. Thorne Creatine is plain creatine monohydrate, for adult players only. The Klean Multivitamin is a basic multi for players with limited diets; it lists no iron, which is a plus if you haven’t been tested. Follow the label for how much to take. Full comparisons: best protein powder for athletes, best electrolyte powders, best creatine and best multivitamin for athletes.

Check the Thorne Whey Protein Isolate price on Amazon

Talk to a professional. Before starting any supplement, check with your doctor or a registered sports dietitian, especially for players under 18 and for anyone who is pregnant, takes medication or has a heart, kidney or other medical condition. This page is general information, not medical advice.

Keep going with water polo training and water polo recovery, compare with our swimming nutrition page, or see how another team sport eats on our soccer nutrition page.

Water polo nutrition: FAQs

What should water polo players eat?

Regular meals built on carbohydrate, protein and vegetables, with snacks around practice. Expert guidance for aquatic athletes suggests about 3 to 10 g of carbohydrate per kilogram per day depending on training, and protein spread through the day, especially after key sessions.

Do water polo players eat enough carbohydrate?

Often not. One study found elite players ate about 4.4 g per kilogram a day, well below swimmers, and another found players’ carbohydrate intake was low during a competitive period while protein was adequate.

How much protein do water polo players need?

A 2014 expert review suggested about 0.3 g of high-quality protein per kilogram right after key sessions and at regular intervals through the day, which is roughly 20 to 25 g per serving for a 75 kg player. Most players can get that from food.

Can teen water polo players take creatine?

The American Academy of Pediatrics advises against creatine for young athletes and says caffeinated energy drinks have no place in teens’ diets. For teen players, eating enough is the focus.

What does NSF Certified for Sport mean?

It means the product has been tested for substances banned in sport and checked that it contains what the label says. It lowers the risk of a contaminated supplement but doesn’t prove the product works.