I’ve worked with clients who have lost 100 to 200 pounds. And most of the time, it happens over the course of three to five years, not three to five episodes on a television show. At least, that’s the case for those who successfully keep the weight off. This is an especially important point, because some research (and recent media coverage) is twisted to suggest that long-term weight loss is hopeless. While many people do, in fact, regain lost weight, it’s not because dropping fat is “mission impossible.” Instead, it starts with changing your definition of “success,” setting aside instant gratification, and understanding how weight loss actually works.

Weight-Loss Dreams vs. Reality

First, some bad news: All nutritional approaches or diet plans stop “working” at some point. Weight loss stops. You don’t see changes, and you believe that either you or the plan are no longer functioning. The good news: When it appears to stop working, it’s actually still working. Confused? Stay with me and it’ll make more sense. We know that as you lose weight, your metabolism tends to slow down—although it’s not absolute. We also know that if you’re patient about it (say, focus on losing one to two pounds per week at most), then you’re more likely to keep it off for good.

But most people quit before significant weight loss occurs. It usually looks something like this:  Dropping one to two pounds per week is considered healthy, but it’s also the average. That means you might lose four pounds one week and zero the next. On those weeks, when the scale doesn’t change, it’s not necessarily a sign that your body has reached its weight-loss limit. To put it another way, your plateau is a normal and necessary part of the process. You must stall in order to move forward (again). And when you understand why—or more importantly, accept this reality—it changes everything.

Ready for the Big Weight-Loss Secret?

Your body does not like change. I don’t care who you are; it’s very resistant to anything that takes it out of its comfort zone. When that change occurs—specifically when you try to lose weight—your body does everything in its power to get you “back to normal.” This is a process known as set-point theory. If more people understood that stagnation is an expected and natural part of the weight-loss process, then they wouldn’t quit prematurely. If you ask me, set-point theory is the reason why so many people fail on long-term weight-loss goals. If more people understood that stagnation is an expected and natural part of the process, then they wouldn’t quit prematurely. Sometimes the scale isn’t moving simply because your body is adjusting to change.

Here’s how it works: We all have a “normal” body weight. Whether we like that weight or not is a different story, but this is the weight that we’ve come to “accept” as our own. We also have a look we desire, whether it’s your college weight, your pre-baby body, or where you were that one time you got super fit a few years ago. Your mind wants to achieve your goals, but your body wants to cling to what’s familiar. So when you try to change, physiological reactions occur to suck you back into the body you’ve known for so long.

The more weight you lose, the harder your body works to resist that change, or even pull you back to your old weight. It does this by slowing your metabolism (comparatively) and increasing your hunger. Sucks, right? It’s not all doom and gloom. If you can hang in there and resist the urge to quit, these changes are temporary and can help ease the permanence of your weight loss.

Set points are not carved in stone. You can undo the process by changing your body and then allowing your body to adjust. This is why plateaus can be so deceiving. Your body is just adapting to its new reality. Once it does, that’s when you’re ready to take the next jump and see a “whoosh” of new weight loss. Everyone’s set point is a little different, so there’s not one hard rule for how long you have to wait. The more weight you have to lose (say, more than 50 pounds), the quicker it can happen initially without hitting your set point. But if you want to lose closer to 15 or 20 pounds, you might hit a wall after the first 10. This is why so many magazine cover lines read “How to Lose the Last 10 Lbs.” They should really say, “How to Be Patient After You Lose the First 10 Lbs.” But that doesn’t sound as sexy.

Once you hit your set point, your body likely needs about four to eight weeks to adjust to your new weight. Then you’ll establish a new set point, and your body will respond like that’s your new normal. It doesn’t sound that exciting, but it’s better than you think. If you go from 200 to 180 pounds or 150 to 130 pounds and wait out the set-point process, your body’s drive to move back to the old weight has changed. It becomes much easier to stay at your current weight because your body no longer thinks it’s outside its comfort zone. This is when you’re able to start losing weight again.

Long-term fat loss never occurs in 30 days or anything magical. It’s a process. Almost any plan can deliver the quick results. Ignore those. Instead, focus on what you think you can do for six to 12 months. When you do, you won’t be as frustrated when you hit the set point. Instead, you’ll be buying time—not buying a new approach (literally)—until the weight loss starts again.