8 min
I had someone ask me on Instagram to cover the topic of why you can’t just out-exercise a bad diet. I made a quick video answering it, and almost as soon as I posted it I knew I’d short-changed the topic. Ninety seconds just isn’t enough time to actually explain what’s going on here, so I wanted to break it down properly on the podcast and now here on the blog. If you’ve got that person in your life who is constantly trying to earn back a bad diet in the gym, send them this one. It should clear a lot of things up.
Most people who try to out-exercise their diet are chasing weight loss or fat loss. They’re using exercise as the tool to create a calorie deficit and hoping that’s enough to get them results. The problem is that exercise, on its own, is one of the worst tools for creating fat loss. I’m not saying it doesn’t help. It absolutely does. But if exercise is the only lever you’re pulling and you’re not adjusting anything else in your life, it’s a really bad strategy and it just does not work long term.
To understand why this happens, it helps to know what a calorie deficit actually is. When you don’t consume as many calories as your body needs, your body pulls the difference from fat stores (among other places), and that’s how you lose body fat. A deficit of roughly 500 calories a day is roughly equal to one pound of fat lost. That number is a rough estimate since there are a lot of individual factors at play, but it’s a useful starting point.
Here’s where things get interesting. Exercise is not the biggest thing burning calories in your body. There are four things that account for the calories you burn each day, and exercise is actually the smallest piece of that pie.
The first is your basal metabolic rate, also called your resting energy expenditure. This accounts for roughly 70 percent of the calories you burn in a day. This is just the energy your body uses to keep you alive, whether you’re at the gym or lying in bed all day. It’s influenced heavily by your body size, since a bigger body, more muscle, more bone, more organ tissue, simply requires more energy to maintain.
The second is the thermic effect of food, which is the energy your body uses to digest what you eat.
The third is non-exercise activity, also called NEAT. This includes things like tapping your foot, talking with your hands, or walking from your car into the office. NEAT accounts for about 15 to 20 percent of your total calories burned.
The fourth is exercise activity itself, meaning your workouts, exercise classes, and runs. This only accounts for about 5 to 10 percent of your total daily calories.
So let’s say your total daily energy expenditure is around 2,000 calories. That means only about 100 to 200 of those calories are coming from exercise. When you look at it that way, using exercise alone to chase a 500 calorie deficit is a losing battle. You’re not focusing on the big rocks that actually move the needle.
It’s also worth noting that your exercise and non-exercise activity levels vary a lot depending on how active your lifestyle already is. Someone with a manual labor job, or someone like me who is on their feet all day as a trainer, is naturally burning more calories through both exercise and everyday movement compared to someone who sits at a desk all day.
Another piece of this puzzle that trips people up is how inconsistent trackers actually are with estimating calorie burn. The wrist based watches and straps that estimate how many calories you burned during a workout are often off by 20 to 40 percent, and sometimes worse. Chest straps (like Polar/Garmin/Morpheus) tend to be a bit more accurate, but it can still carry an error range of roughly 3 to 20 percent, which still isn’t something I’d consider trustworthy enough to build a plan around.
To put that in perspective, if your tracker told you that you burned 1,000 calories during a workout but it was off by 40 percent, the actual number could be significantly lower. That’s a big enough gap to completely undermine a deficit you think you’re creating.
In my experience, the real issue when it comes to this topic is what people are actually eating and how well they understand how much they’re consuming. According to self-reported data collected by the CDC through NHANES, men report eating about 2,100 calories a day and women report about 1,800. But when researchers have run metabolic ward studies, where people are essentially observed and their actual intake is measured directly, most people underestimate what they eat by about 20 to 40 percent. In some studies, that gap is even larger on average for people who have a higher BMI, with underestimation sometimes reaching a thousand or even two thousand calories a day.
When you account for that 20 to 40 percent gap, men who think they’re eating 2,100 calories a day are more likely eating somewhere in the range of 2,500 to 3,000. Women who think they’re eating 1,800 are more likely eating 2,200 to 2,500. That works out to a real world difference of 400 to 900 calories a day for men, and 400 to 700 calories a day for women. Remember, we’re chasing a 500 calorie deficit to lose about a pound of fat a week. If you’re unintentionally eating a few hundred calories more than you think, on top of burning fewer calories through exercise than your tracker tells you, you can end up sitting right at maintenance or even in a surplus without realizing it. This is why so many people feel like they’re doing everything right, exercising consistently and eating what they think are the right foods, and still aren’t seeing results.
So how do we actually fix this? Here’s what I tell my clients.
Stop relying on calorie burn trackers. They simply aren’t reliable enough to base your decisions on. Managing your intake is going to move the needle far more than obsessing over how many calories a workout supposedly burned.
Start tracking what you actually eat. If you’re willing to track calories, it doesn’t take much more time than just eyeballing a bowl of food. Put it on a scale and see what you’re actually consuming. Apps like Macros First, Cronometer, and MyFitnessPal all work well for this. If you’d rather skip manual tracking altogether, take the calorie target those apps give you and plug it into an AI tool like Gemini, ChatGPT, or Claude. Tell it how many calories you need, what kinds of foods you enjoy, and ask it to build you a meal plan and a grocery list. It takes almost all the guesswork out of it.
This works when you’re eating out too. I know I typically budget around 1,000 calories for dinner because I keep breakfast and lunch lighter. When I’m heading to a restaurant, I’ll tell an AI tool something like, I’m going to Longhorn Steakhouse in Greenville, North Carolina, give me five options at 1,000 calories or less with at least 30 grams of protein and a fruit or vegetable included. That gets me a condensed version of the menu I can actually make a decision from, and it helps make sure I’m staying on track while living my life.
Track your consistency, not just your intake. Get a calendar and stick it on your fridge. If there are days you don’t track food or don’t stick to your plan, mark those with an X on a calendar. On the days you do stick to it, put a check mark. You want to be at bare minimum 80% compliant, which works out to at least 24 out of 30 days. Ideally you want to be up in the 90% range, because that’s going to give you a much more accurate picture.
Keep your activity consistent, but don’t judge a workout by how many calories it supposedly burned. As you get into better shape, your body actually becomes more efficient and you’ll burn fewer calories doing the same workout. That’s a sign of progress, not a sign that your session wasn’t good enough.
Watch your step count. Keep it somewhere in the 5,000 to 10,000 range. When you’re in a true calorie deficit, you’re likely to feel a bit more tired, which makes you less likely to take the stairs or park farther away. Keeping an eye on your step count helps you catch that drop in everyday movement before it quietly derails your progress.
Track your weekly workouts too, whether that’s classes, lifting sessions, or runs. Consistency here matters just as much as consistency with food, because if that activity drops off, you’re messing with the calorie equation from the other direction.
If your goal is fat loss, track your measurements alongside your weight. For roughly every inch you lose off your waist, (measured at the narrowest point between your hip bones and the bottom of your ribs) that’s roughly five pounds of fat lost. Comparisons between waist circumference and DEXA scans have shown that fat loss shows up in that measurement even when the scale doesn’t move. That’s why I tell people not to let the scale dictate their whole day or their whole journey. The scale can be misleading, and honestly I wish more people would put less weight on it (no pun intended… ok maybe) and focus more on their waist and neck circumference instead. Those two measurements tell you a lot more about what’s actually happening with your body composition and overall health.
You can’t out-exercise a bad diet because exercise simply isn’t the biggest driver of the calories you burn each day. Your basal metabolic rate, the energy your body needs just to function, dwarfs what you burn through workouts. On top of that, both calorie trackers and self-reported eating habits tend to be wildly inaccurate, which means most people are working with numbers that don’t reflect reality. The fix isn’t to work out harder or longer. It’s to get a clearer, more honest picture of what you’re eating, track your consistency instead of chasing perfect numbers, and use tools like food scales, tracking apps, and even AI to take the guesswork out of the equation. Do that, and the exercise you’re already putting in will finally start working the way you expect it to.
Chat with Coach Bryan to discover how our programs can fit into your lifestyle and help you achieve your goals. Let’s get you started on your fitness journey today!
