Why Running Doesn’t Help You Lose Weight the Way You Think

August 30, 2025 | By

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Most runners think nutrition is about eating ‘healthy.’ But here’s the truth—what works in the gym doesn’t always work for the long run. Today, we’re talking macros, supplements, and why eating more might actually make you faster.

Listen to audio podcast below on your next run or watch the video above to learn more

What You’ll Learn

  • How to balance carbs, protein, and fat like a runner—not a bodybuilder
  • Which supplements actually help, based on evidence and science
  • Why running more doesn’t always mean losing weight—and how to fuel without gaining it back

Disclaimer

This is all for general information and entertainment purposes only. I am not your dietician or nutritionist and you should consult one even if for one session to help sort out any specific needs that you may have. Nutrition is very individual so experiment with everything I say and don’t take anything as hard truth for you even if science backed.

Balancing Macronutrients, Micronutrients and Supplements

What It Is:

We’re getting into the weeds a bit with nutrition but I’m sure most of you know what Macronutrients aka macros are from all the health and fitness influencers on social media.

Quick refresher – it’s the building blocks of a running diet: carbs, protein, and fat. Getting this mix of all three right helps keep you energized for your runs and helps you recover so you can come back and do more work to repeat the cycle.

This works just like the blueprint for building something mechanical and large… like a house.

Carbs are the scaffolding, protein is the bricks, and fat is the truck delivering supplies. Micronutrients? They’re the nuts and bolts. Supplements? Emergency backup when you’re out of stock.

How to Do It:

  • Prioritize carbs: They should make up 50-65% of your calories as a runner (about 5-7g per kg of body weight, or 2.3-3.2g per pound). I personally have found I can go on the lower end of acceptable and do fine with the type of running I do (faster 5k type interval stuff) but I do ramp them up on longer days if I’m training for a marathon.

Or as Jordan, a sports dietician, told me:

“If you’re doing longer endurance sessions, you probably want to be getting at least five grams per kilo of body weight in carbs per day. But if you’re training a lot, you’d be going up to 7, 8, 9 grams per kilo.”

In other words—don’t fear the carbs. They’re the engine room of endurance.

  • Note to Keto/Low Fat/Fasted Evangelists – Yes you can do it… and some can do it well. I’ve done it well but it was at the long term cost of performance and recovery. So if you want to cycle high carbs/fasting/low carb you can, but this is not the blog post for that. Maybe I’ll do one later – hit me up if you want a specific on on that.
  • Protein is 2nd important. This should make up 15-20% of your calories (about 1.2-1.6g per kg of body weight, or for Americans about half to 1 gram per pound). This helps with recovery from the hard and long workouts and repairs muscle and tissue damage. Eating foods high in collagen protein is great for older runners or runners with tendon and ligament issues.
  • Fat matters, too as it helps move around the micronutrients in your blood to the right areas. But focusing on “healthy omega 3 and some omega 6 fats” and staying away from saturated fats for most meals is best so you don’t gain unnecessary body fat that may slow you down.

I usually just take in whatever fats come with my protein as it’s hard to get high protein without high fat from natural food sources. This is why supplements like protein powders are great especially whey isolate—which have little to no fat, which makes it easier to hit your protein target without blowing up your calories.

micronutrients could be a whole post on its own but I’ll quickly go over why they are important and how to not over think it.

  • Micronutrients like vitamins and minerals are essential for energy production, muscle function, and recovery.
  • Get them naturally through colorful fruits, vegetables, and whole grains instead of relying solely on supplements.

Overall, focus on whole, minimally processed foods. A balanced plate could look like 1/3 carbs, 1/3 protein, and 1/3 veggies.

Why It’s Important:

Runners often obsess over macronutrient ratios when they should be focusing on consistency that is right for them. Balanced meals help your body recover faster, run longer, and feel better.

You’ve got your macros dialed, your supplements sorted—but here’s the thing… none of it really works if your overall intake is misaligned.

Supplements for Runners

If you’re already eating well, do supplements actually help—or are they just expensive placebos?

Supplements add to an already proper diet. I think of it like insurance. Just in case the food you’re eating isn’t enough in a few areas with micro nutrients, etc.

Everyone is different and has different objectives but there are a few key supplements that I think most runners should take regularly that I’ve taken myself:

  • Creatine: A naturally occurring compound that helps supply energy to muscle cells, enhancing strength and power output during high-intensity exercise.
  • Protein powder: A concentrated form of protein (usually whey, casein, or plant-based) that helps with muscle recovery and growth.
  • Collagen: Pro Tip – If you’re using collagen for tendon or joint health, try taking it with vitamin C about 30 minutes before your run or strength session.
  • Magnesium glycinate: A highly absorbable form of magnesium bound to glycine, known for better bioavailability and fewer digestive side effects compared to other magnesium forms.
  • Antioxidants: Compounds that help protect cells from damage caused by free radicals, with examples including green tea extract and tart cherry juice.

Losing Weight & Overeating

I’ll quickly touch on a topic that most runners think about: weight loss. And something runners don’t think of and isn’t talked about enough: over eating.

What It Is:

Running to lose weight could work for some but doesn’t work for most, myself included.

The Reason Why:

Anecdotal thinking from most new runners (myself included) is that when you run more, you burn more calories and therefore you lose weight. But you actually increase your appetite and you end up eating more and choosing not so great food options. This is because your brain and body don’t have an exact amount button.

The Solution:

Eat not to be full, but instead to not feel hungry. Two vastly different things.

Portion control and counting calories for 1-2 days. Yes not glamorous but knowing how many calories you need on an easy run day or off day and how many you actually eat on a hard run day is crucial. You can then run it through Basal Metabolic Rate (BMR) – not to be confused with BMI (Body Mass Index). BMR is known to be an accurate calculator online to find out what your macros and calories should be to gain, lose or maintain weight.

It’s not perfect, so keep experimenting for about 2 weeks to see if you’re gaining or losing weight. This is best done in the non-run off-season because trying to lose weight while training for your fastest marathon are usually mutually exclusive activities for most people. You need to be eating a lot when you’re going the fastest you’ve ever gone.

The Finish Line

Running nutrition doesn’t need to be complicated. Habitually follow some basic rules

  • Eat simple carbs before, during and after hard or long runs
  • Get in good fats and protein post run and throughout the day
  • Hydrate slowly and intelligently throughout the day and pair with electrolytes
  • Don’t fall for the hype around getting all the expensive supplements
  • And don’t eat to be full, eat to feel not hungry. Eat more on harder long days and less on easy or off days.

If you’re still convinced you need $300 worth of energy gels to survive a 5k, drop a comment below or email talk@1betterrun.com so we can argue… errr have a respectful disagreement 😀. Remember: one bite, one sip, one percent better every day. Peace.

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