Coming off the jab? Why the weight comes back, and how to keep what you've worked for

Half of people stop weight-loss jabs within a year, and the weight often comes back. Here's why it happens and the food and training plan that helps you keep your results.

By Clay Livingston · 29 September 2026 · 6 min read

The problem nobody mentions at the start

Weight-loss jabs work. In a 2026 Oxford review published in the BMJ, people taking newer medicines such as Wegovy and Mounjaro lost 14.7kg over about nine months on average. For many people that's life-changing.

But most people don't stay on them forever. A large Danish study of more than 157,000 first-time semaglutide users found that 49% stopped within 12 months. Cost goes up, side effects wear you down, or you simply want to manage on your own. And the same Oxford research carries a hard truth: on average, people regained the weight within about 20 months of stopping, and improvements in blood sugar, cholesterol and blood pressure faded too.

The weight isn't the only thing that fades. A US study of more than 333,000 veterans with type 2 diabetes found that stopping or pausing treatment for as little as six months was linked to a rise in heart attack and stroke risk. Compared with people who stayed on the medicine, risk was 4% higher at six months, 14% at a year and 22% by the second year, which largely erased the benefit.

That's not a reason to panic, and it's not a reason never to stop. It's a reason to plan.

Why it happens: the muscle you didn't mean to lose

The jabs quieten your appetite, which is the point. But eating much less, for months, has a side effect. A review commissioned by Les Mills and backed by UKactive found that between 20% and 50% of the weight lost can be lean mass, and that the amount typically lost was comparable to around a decade of ageing.

Muscle is your body's engine. It burns energy at rest, keeps your joints stable and keeps you strong as you age. Lose a chunk of it, and when your appetite returns you're running a smaller engine on the same amount of fuel. That's part of why the weight can come back faster than it went.

Food quality slips too. Research suggests these medicines can cut daily calorie intake by between 16% and 39%, and researchers at the University of Cambridge and UCL warn that many users get little or no structured guidance on diet quality, protein or vitamins and minerals while their appetite is suppressed. There's even early evidence that people on the drugs move less: an analysis of Fitbit data found daily activity dropped.

Add it up and a lot of people finish their course lighter, but with less muscle, fewer cooking habits and less movement in their week. Then the appetite switches back on.

The solution: build the habits before you need them

The encouraging part of the Oxford research is the comparison. People who lost weight through healthier eating and exercise kept it off for far longer, just under four years on average, and weight came back almost four times faster after the drugs than after behaviour-based programmes. The habits are what last. So whether you're still on the jab, tapering off or already stopped, these are the four things to put in place.

1. Strength train two or three times a week

This is the single biggest lever for protecting muscle. The UKactive review recommends that people on these medicines do strength training two to three times a week, plus 150 minutes of moderate to vigorous activity, noting that this helps continue fat loss in the maintenance phase and lessens regain after treatment stops.

You don't need a gym. A kettlebell goblet squat, dumbbell rows, press-ups against a worktop and a plank will cover the basics. Start light, focus on form and add a little each week.

2. Put protein at the centre of every meal

When you're only managing small portions, what's on the plate matters more than ever. Build each meal round a protein: eggs, Greek yoghurt, fish, chicken, lentils, tofu, cottage cheese. Then add vegetables and some slow carbs. If a full plate feels like too much, eat the protein first.

3. Cook real food, and keep a shopping list

The drugs take away the noise around food. When that noise returns, the easiest foods to reach for are the ones in packets. Having a week of simple meals planned, and the ingredients already in the fridge, makes the good choice the easy one. It also rebuilds the cooking habit many people lose while their appetite is low.

4. Plan for the hunger coming back

It will come back, and it may feel louder than before. Scientists are even studying signs of an "obesity memory" in the fat cells of mice that may help explain why the body is primed to regain weight. That's not a willpower failure. It's biology, and the answer is structure: regular meals, enough protein and fibre to stay full, and a plan for the week so you're not deciding what to eat when you're starving.

A word on fasting: if you're still on a jab and already eating very little, don't add a fasting window on top without talking to your prescriber first. It can make hitting your protein and nutrient needs even harder.

How FuelPlan Pro helps

FuelPlan Pro was built for exactly this part of the journey: the long stretch where results come from habits, not a pen.

You tell it your calorie target, what you eat and what you don't. It builds a full week of meals round protein, with portions for your goal. It turns those meals into a shopping list sorted by aisle. It plans strength sessions you can do at home with kettlebells, dumbbells or bands, with timers and form demos. And the weekly coach report shows how your weight, activity and eating are trending, so you can spot a slide early rather than three months later.

It won't replace your GP or prescriber. But it gives you the food and training structure that the research keeps pointing to as the thing that makes results last.

This article is for general information only and isn't medical advice. Don't start, stop or change any prescribed medication without speaking to your GP or prescriber. If you have a medical condition, a history of eating disorders, or are pregnant or breastfeeding, get professional advice before changing your diet or exercise.