Most runners know the feeling: A tough interval session where your legs can feel tired, or your stomach reacts to the wrong snack. With a few adjustments to what and when you eat, you can often make intervals more comfortable and get more out of your training.
Below, you’ll get a concrete guide to a pre-interval run snack, so you can show up with a calm stomach, energy for the work, and a better overview of your energy plan.
Why a snack before interval running can pay off
Intervals push the body hard in a short time. You often work close to your maximum capacity, and the muscles primarily use carbohydrate as a fuel source. If it’s been a long time since your last meal, it can increase the risk of:
- Early fatigue
- A drop in pace on the last repetitions
- Dizziness or an empty feeling in the body
A small, well-thought-out snack that is primarily carbohydrate can help to:
- Keep the intensity more stable throughout the entire session
- Feel less heaviness mentally and physically
- Get more quality out of the time you spend on intervals
The focus is not to eat as much as possible, but to get enough easily digestible carbohydrate at an appropriate time before the start.
When you should eat before interval running
It can be helpful to distinguish between the main meal and a smaller snack closer to training.
Main meal about two to three hours before
The main meal can form a good foundation for your energy level. Here you can eat a normal, slightly larger meal with:
- Complex carbohydrates such as rice, pasta, bread, or oatmeal
- A moderate amount of protein
- Limited fat and very coarse fiber
Examples could be:
- Oatmeal with fruit and a small amount of nuts
- Whole-wheat pasta with tomato sauce and lean meat
- A sandwich with chicken and a little greens
Snack about thirty to ninety minutes before
The snack can support energy availability closer to the session and is typically quicker to digest than the main meal:
- Sixty to ninety minutes before, you can often tolerate a slightly larger snack
- Thirty to sixty minutes before, a small, simple snack is typically best
- Less than thirty minutes before, liquids or very small amounts may work best for some
Many runners aim for around twenty to forty grams of carbohydrate in a snack thirty to sixty minutes before a hard session. Adjust based on your weight, your stomach, and how big the main meal was.
What the snack should contain and what you should watch out for
For intervals, the focus is often on carbohydrates that are easy to digest. It can be a practical way to get energy close to training.
A good composition will typically include:
- Primarily carbohydrate from bread, fruit, an energy bar, sports drink, or gels
- A limited amount of protein
- Low content of fat and very coarse fiber
It can be a good idea to be cautious with right before intervals:
- Very fatty foods such as pizza, burgers, fatty cheese, or sausages
- Very coarse whole-grain products in large amounts
- Large amounts of raw vegetables or legumes
An oat-based energy bar like Energy Snack can be a practical choice about thirty to sixty minutes before intervals. It is developed for use in connection with sports and contains carbohydrate sources that are easy to bring on the go.
Choosing between a bar, gel, and sports drink before intervals
Whether you choose a bar, gel, or sports drink before intervals depends on how close to the start you eat and how your stomach reacts when your heart rate rises.
One to two hours before with a solid snack
Well ahead of training, most people can often eat solid food without major issues. Here you can, for example, choose:
- White bread with jam or honey
- A small portion of oatmeal with fruit
- An Energy Snack about sixty to ninety minutes before, if you prefer a bar developed for sport
Thirty to forty-five minutes before with a light snack
Closer to the start, it can be an advantage to keep the snack small and simple so your stomach doesn’t feel heavy:
- A banana, which typically provides about twenty to twenty-five grams of carbohydrate
- A slice of toast with jam
- A smaller energy bar
Less than thirty minutes before with fast energy
When there’s little time until the start, many prefer liquids or very small snacks. Here you can use:
- Sports drink with carbohydrates
- A gel with a little water
- A small smoothie or a glass of juice
For very intense sessions such as short track intervals or hard hill intervals, solid food close to the start can feel heavy for some. In those situations, an Energy Gel or a carbohydrate-containing sports drink can be an alternative, especially if it has been many hours since your last meal.
For longer or hot sessions where you want carbohydrates and electrolytes, a sports drink like Carbo Race Electrolyte can be part of your plan before or during training, depending on duration and intensity.
Hydration and electrolytes when the intervals bite
Even though intervals are often shorter in total time than long distance runs, the intensity is high, and you typically sweat more per minute than during easy training. That means you not only lose fluid, but also electrolytes such as sodium, potassium, magnesium, and calcium, which contribute to normal fluid balance and normal muscle function.
It can therefore be relevant to:
- Show up to training with an appropriate fluid intake rather than drinking a whole bottle right before the start
- Drink a little water or sports drink during the last one to two hours before training
- Consider extra electrolytes if it’s warm, you sweat a lot, or you often experience cramps
Hydro Tabs are developed to make it easy to add electrolytes to your bottle before, during, or after training. They can be used together with carbohydrate products like Carbo Race if you want to combine energy and electrolytes in your plan.
Three practical snack strategies before interval running
Below you’ll find three scenarios you can use as a starting point and adjust to your everyday life, your training, and your stomach.
Afternoon session after work
- Lunch around twelve to thirteen
- Intervals around seventeen to eighteen
Suggested strategy:
- A small snack at sixteen to sixteen thirty with twenty to forty grams of carbohydrate
- Examples could be a banana plus a slice of toast with jam, or an Energy Snack about forty-five to sixty minutes before
- Light hydration from mid-afternoon with water and possibly a mild sports drink
Early morning intervals
- Limited appetite early in the day
- Start training around six to seven
Suggested strategy:
- Avoid heavy food and consider liquid or small snacks
- About twenty to thirty minutes before, you can drink a small amount of sports drink, for example a mild mix of Carbo Race Electrolyte
- Alternatively, you can take a gel with water if you don’t do well with solid food in the morning
- Have a larger breakfast after the session when your appetite is better
Intervals a few hours after dinner
- Light dinner around eighteen
- Intervals around twenty to twenty-one
Suggested strategy:
- Make sure dinner isn’t too fatty or very high in fiber
- Thirty to forty-five minutes before, you can top up with a small piece of fruit or half to a whole energy bar
- Drink a little water gradually, but avoid drinking a lot right before the start
Frequently asked questions about a snack before interval running
How long before interval running is it best to eat a snack?
For most people, thirty to sixty minutes works well for a small, light snack. Larger meals are typically placed two to three hours before training.
How much should I eat before intervals?
Many runners choose around twenty to forty grams of carbohydrate in the snack itself thirty to sixty minutes before. You can adjust the amount based on body weight, stomach, and your other meals during the day.
Should there be protein in the snack before interval running?
A small amount of protein can be fine, but around the intervals themselves the focus is often carbohydrate and stomach comfort. You can choose to prioritize protein intake in a meal after training.
What should I avoid right before intervals?
Very fatty and high-fiber foods, as well as large portions shortly before the start, can increase the risk of discomfort and an unsettled stomach during training.
Can I use gels as a snack before interval running?
Yes, many choose a single gel fifteen to thirty minutes before hard sessions, especially if the last meal was several hours earlier. Remember to drink a little water with it.
Do the same principles apply to short and long intervals?
The basic principles are the same, but the longer and harder the session is, the more important it can be to show up with available energy from your meals earlier in the day and possibly an appropriate snack before training.
How to test your snack strategy in practice
The body responds differently from person to person, and there isn’t one solution that fits everyone. Weekly intervals are an obvious place to test what works for you, long before you find yourself on the start line of a race.
- Experiment with timing, for example sixty minutes versus thirty minutes before the start
- Adjust the amount of carbohydrate up or down and feel the difference in perceived energy and stomach comfort
- Test whether you do best with a bar, gel, chews, or sports drink as your primary snack
If you want to work even more purposefully with your energy plan, you can find inspiration in the guide energy chews when do they make sense and combine them with, for example, energy chews, Energy Snack, Carbo Race, and Hydro Tabs depending on what your training sessions look like.
The recommendations in this guide are general and cannot replace individual advice. If you have medical conditions, special considerations, or are unsure, it’s a good idea to talk with your doctor or a dietitian. Use training to learn what works in practice so you can show up to your intervals with a plan you trust.