Pizza can work for carb loading, but it’s not ideal in its typical form. The high fat content in most pizza slows digestion and makes it harder to eat enough total carbohydrates to fully stock your muscles with glycogen. With some modifications, though, pizza becomes a more practical option, and the fat issue may matter less than you think if you’re loading over a full 36 to 48 hours.
What Carb Loading Actually Requires
Effective carb loading means consuming 8 to 12 grams of carbohydrates per kilogram of body weight per day for 36 to 48 hours before your event. For a 70-kilogram (154-pound) athlete, that’s 560 to 840 grams of carbs daily. At that intake, sustained over two days, muscle glycogen levels can roughly double compared to a normal diet.
This strategy benefits events lasting longer than 90 minutes: marathons, half ironmans, long cycling races, and similar endurance efforts. For shorter events, standard pre-race meals are enough and full glycogen loading isn’t necessary.
The challenge is volume. Eating 700-plus grams of carbs in a day means nearly every meal and snack needs to be carb-dense. Foods high in fat take up stomach space and contribute calories without moving you closer to your carb target. That’s where pizza gets complicated.
The Fat Problem (and Why It’s Smaller Than You Think)
A typical slice of delivery pizza packs 10 to 15 grams of fat alongside 25 to 35 grams of carbs. Eat four slices and you’ve taken in roughly 120 grams of carbs but also 40 to 60 grams of fat. Compare that to a large bowl of pasta with marinara sauce, which delivers a similar carb load with a fraction of the fat. Fat fills you up faster, meaning you may struggle to hit your carb targets if pizza dominates your meals.
Here’s the nuance, though: a study on well-trained triathletes found that adding fat and protein alongside carbohydrate meals did not reduce the total amount of glycogen stored over 24 hours. Athletes who ate 7 grams of carbs per kilogram plus extra fat and protein replenished glycogen just as well as those eating carbs alone. The fat slowed glucose absorption into the bloodstream, but the muscles still pulled in the same amount of glycogen by the end of the day.
So if you’re loading over a full 36 to 48 hours, having pizza as one of your meals won’t sabotage glycogen storage. The risk is more practical: fat fills you up, and if you can’t eat enough total carbs because you’re too full from cheese and pepperoni, you’ll fall short of your target.
How to Make Pizza Work Better
The goal is to maximize carbs while keeping fat moderate. A few changes make a big difference:
- Choose thick crust over thin. This sounds counterintuitive if you’re thinking about calories, but for carb loading, a thick, doughy crust is the point. The crust is where most of the carbohydrates live. The Hospital for Special Surgery specifically recommends thick-crust pizza as a good source of carbohydrate for athletes.
- Go easy on cheese. Full-fat mozzarella is one of the biggest fat contributors. Use light mozzarella, a small amount of goat cheese (which spreads further for fewer fat grams), or fat-free ricotta warmed in a saucepan and dolloped on top.
- Skip greasy meats. Pepperoni, sausage, and bacon add fat without meaningful carbs. Lean chicken, turkey pepperoni, or chicken sausage are better protein options if you want meat.
- Load up on veggie toppings. Bell peppers, mushrooms, onions, spinach, and artichoke hearts add volume and micronutrients without significant fat.
- Pair it with more carbs. Have a side of bread, a glass of juice, or fruit alongside the pizza. This helps you hit your carb target without relying on pizza alone.
A modified thick-crust veggie pizza with light cheese can deliver 40 to 50 grams of carbs per slice with significantly less fat than a standard pepperoni slice. Four slices of that gets you to 160 to 200 grams of carbs in a single sitting, which puts a real dent in your daily target.
Sodium: An Underrated Benefit
One thing pizza has going for it that pasta doesn’t is sodium. Commercial pizza is one of the highest-sodium foods in a typical diet, and for endurance athletes loading before a long event, that’s actually useful. Sodium helps maintain blood volume, stimulates thirst (encouraging you to drink more), and reduces urine output, all of which support better hydration going into race day.
Plain water alone isn’t great at restoring fluid balance because it dilutes blood sodium levels and triggers your kidneys to flush fluid. The sodium in pizza helps your body hold onto the fluids you’re drinking during the loading period. For athletes who tend to be heavy sweaters or who are racing in heat, the extra sodium from a pizza meal can be a practical advantage.
Timing and Digestion
When you eat pizza during the loading window matters. As a dinner two nights before your event or a lunch the day before, pizza gives your body plenty of time to digest the fat and absorb the carbs. As your final pre-race meal, it’s riskier.
Fat, protein, and fiber all slow gastric emptying, and pizza contains all three. During high-intensity exercise, blood flow shifts away from your gut and toward working muscles, which means anything still sitting in your stomach can cause problems. Athletes who consume high-fat or high-fiber meals too close to competition report higher rates of nausea, stomach cramps, and diarrhea. These gastrointestinal issues are among the most common reasons endurance athletes underperform on race day.
If you want pizza the night before your race, eat it for an early dinner rather than a late one, giving yourself at least 12 hours before the start. Your final pre-race meal (3 to 4 hours before the gun) should be lower in fat and easier to digest: oatmeal, toast with jam, a bagel, or plain pasta.
Pizza vs. Traditional Carb-Loading Foods
Pasta, rice, bread, potatoes, and oatmeal remain the gold standard for carb loading because they deliver high carb density with minimal fat. A large plate of spaghetti with marinara can easily hit 100 to 120 grams of carbs with under 5 grams of fat. You’d need to eat significantly more pizza to match that carb total, and you’d take in far more fat doing it.
That said, carb loading over 36 to 48 hours means eating a lot of meals, and monotony is real. If eating nothing but rice and pasta kills your appetite by meal four, a modified pizza can be a welcome change that keeps you eating. The best carb-loading strategy is one you can actually stick with. Having one pizza meal mixed in among pasta, bagels, and rice is a perfectly reasonable approach. Making pizza your only carb source for two days straight would make hitting 10 to 12 grams per kilogram much harder.
Think of pizza as a supporting player in your carb-loading plan rather than the headliner. Choose thick crust, go light on cheese and fatty meats, eat it earlier in your loading window rather than right before the race, and build the rest of your meals around more carb-efficient options.