Is Willpower the Reason You Can't Keep Weight Off?

Is willpower — or the lack of it — the reason you can't keep weight off? Or is there another reason you "fall off the wagon"?

The answer is probably somewhere in the middle. At the start of a health change, willpower and motivation are what get you out the door on a cold morning. But they're not why you keep doing it long term — that comes down to habits and lifestyle changes, built over an extended period of time.

What's Actually Happening in Your Body

There's some solid research now looking at our biology during weight loss, specifically the hormonal response from our hunger hormones — leptin (the hormone that signals fullness, but drops during a deficit) and ghrelin (which rises, driving hunger). What does that mean in real terms? It means you end up hungrier, and less satisfied by the food you're eating.

So why am I talking about hormones in an article about willpower? Because when people "fall off the wagon," it's sometimes not even within their control — not if they don't understand what's happening biologically once their body is in a calorie deficit.

The "Just Be In a Deficit" Myth

If you've spent any time on social media, you've probably seen the reel telling you that you're not losing weight because you're not actually in a calorie deficit — no matter what you think. Scientifically, they're right. A calorie deficit is still the underlying mechanism behind weight loss — that part of the science isn't in question. What's wrong is the conclusion people draw from it: that all it takes is more willpower to stay in one. If it were really that simple, we wouldn't be living through an obesity epidemic.

Here's why: those love-them-hate-them hunger hormones are working against your willpower, because your body doesn't want to be hungry. A calorie deficit is a stressor — plain and simple — which is exactly why I don't recommend putting yourself under unnecessary pressure, or signing up to rigid, time-restricted health plans.

This is also why willpower only gives you that short burst of motivation and early success, but it never sticks around once things get hard. Which is exactly why building habits is the single most important factor for long-term success. (If you want the full breakdown of what a calorie deficit actually is, I've gone deep on that here).

Why "Just Have More Willpower" Falls Apart by Evening

The thing with willpower is, you wake up with 100% in the tank. By the end of the day, you're almost empty, and it takes real effort to make the healthy decision — heading to the gym, prepping lunch for tomorrow. It's easy to just say "f*** it" and start again tomorrow.

Do this on repeat, though, and those health goals will slowly dissolve to nothing. So in these moments, willpower does need to show its gold-plated head. That's why being kind to yourself — while setting goals that are realistic and measurable for your current lifestyle — matters. Habits are what keep your health goals moving. Actually starting them in the first place — that's willpower.

Even I Still Have "F*** It" Moments

Take me, for instance. I train six days a week and prep my food for the next day almost every working day. At this point, it's just part of who I am — part of the lifestyle I've built. Do I still have "f*** it" moments? Yes. I used to beat myself up over them. It would put me in a bad mood if I missed a session, or if I ran late to work the next morning because I hadn't prepped the night before.

This is the unhealthy part of trying to be healthy. We're never perfect in any other part of our lives, yet somehow, when it comes to health and fitness, there's an expectation of perfection. The message that you don't lose weight because you lack willpower is a dangerous one — and it doesn't have your best interests at heart.

So What Actually Works?

If willpower isn't the answer, what is?

It's habits — built slowly, repeated until they no longer require a decision. The moment prepping your lunch or getting to the gym stops being a battle of willpower and starts being simply what you do, you've won. Not because you found more discipline, but because you no longer need it in the same way.

That's not something that happens overnight, and it's not something that happens by being perfect either. It happens through small, realistic, measurable changes stacked over time — the kind that hold up on your bad days, not just your best ones.

If you're tired of relying on willpower alone to get you through, that's exactly where coaching comes in — not to hand you more rules, but to help you build the habits that make willpower unnecessary in the first place.