Beyond the Jab

In just a few years, weight-loss injections have gone from a specialist treatment to a household name. A study from University College London estimated that around 1.6 million adults in Great Britain used drugs such as Mounjaro and Wegovy for weight loss in a single year, most of them buying privately.¹ For many, the results are life-changing. But the injections work by helping you eat much less, and what you do eat, and how you live while taking them, matters more than ever.

How the injections work

Semaglutide (Wegovy and Ozempic) and tirzepatide (Mounjaro) copy hormones your own gut makes after a meal, chiefly GLP-1 (tirzepatide also copies a second hormone, GIP). These hormones tell the brain you are full, slow the emptying of the stomach and help the body release insulin when blood sugar rises. Many people describe the quietening of constant thoughts about food, the so-called "food noise", as the biggest change of all. (See The Hormone Web.)

In the major trials, people lost around 15% of their body weight on semaglutide over 68 weeks, and up to about 21% on the highest dose of tirzepatide over 72 weeks.^2,3 Semaglutide has also been shown to lower the risk of heart attack and stroke in people with heart disease and excess weight.⁴ These are powerful medicines, and for people who need them, they can be a real turning point.

The hidden costs

Eating far less, quickly, has consequences that are easy to overlook:

• Muscle loss. In the semaglutide trial, around 40% of the weight lost was lean tissue, which includes muscle, rather than fat.² Muscle is our metabolic engine, our protection against falls and frailty, and one of the best predictors of healthy ageing.
• Bone loss. Rapid weight loss is linked with thinning bones, especially when protein, calcium and strength training are low. (See Living Bones.)
• Running low on nutrients. Smaller meals mean fewer vitamins and minerals. Protein, iron, B12, vitamin D, calcium, magnesium and zinc can all fall short, and tiredness, hair loss and low mood may follow.
• Digestive troubles. Nausea, reflux and especially constipation are common, as everything moves more slowly through the gut.
• Gallbladder strain. Rapid weight loss can encourage gallstones.

A joint advisory from four leading nutrition and obesity organisations put it simply: the injections work best alongside good nutrition, adequate protein, strength training and support.⁵

Lose the fat, keep the muscle.

Eating well on the injections

When your appetite is small, every mouthful needs to count:

• Protein first. Start each meal with protein: eggs, fish, chicken, lentils, beans, tofu, Greek yoghurt or kefir. Many specialists suggest roughly 1.2–1.5 g of protein per kilo of body weight a day while losing weight; a practitioner can work out the right amount for you.
• Colourful vegetables and fibre at every meal, for vitamins, minerals and a healthy gut. Fibre, plenty of water and gentle movement are the best natural answers to constipation.
• Small, nutrient-dense meals. Soups, dals, stews and simple plates are easy to eat when your appetite is low. Our recipes can be filtered by nutrient, from calcium to iron.
• Ferments such as sauerkraut, kefir and live yoghurt support the gut through big changes in diet. (See The Master Regulator.)
• Go easy on fatty, fried and very sugary foods, which often make nausea and reflux worse.
• Drink well. The injections can dull thirst as well as hunger, so sip water and herbal teas through the day.

For nausea, ginger and peppermint have long been used to settle the stomach, but which herbs suit you depends on your constitution, and it's always wise to check any herb or supplement with your GP or pharmacist, as the injections slow digestion and can change how other medicines are absorbed. (See When Plants Meet Pills.)

Move to keep your muscle

Strength training is the single best way to protect muscle and bone while losing weight. Two or three sessions a week, using weights, resistance bands or your own body weight, is enough to make a real difference, alongside daily walking. Start gently and build up. (See Born to Move.)

Planning for life after the jab

The injections don't change the underlying biology of appetite permanently. One year after stopping semaglutide, people in the trial had regained around two-thirds of the weight they had lost.⁶ In a tirzepatide trial, people switched to a dummy injection regained much of their weight, while those who continued kept losing.⁷

This isn't a failure of willpower; it is how the body defends its weight. But it means the months on the injections are a precious window. The quieter appetite makes it easier to build new habits that will still be there when the medicine isn't: regular, protein-rich meals, a kitchen full of real food, daily movement, good sleep and ways to handle stress that don't involve food. Never stop or change the dose of a prescribed medicine without talking to your prescriber, and plan any change together.

Supporting your own GLP-1, naturally

Your body has always made its own GLP-1, in special cells lining the gut. Natural approaches don't come close to the effects of the injections, but they can help support appetite and blood sugar control, on or off medication:

• Feed your microbes fibre. When gut bacteria ferment fibre, they make short-chain fatty acids that stimulate the gut's own GLP-1 release.⁸ Beans, lentils, oats, vegetables, nuts and seeds all count.
• Eat in the right order. Eating vegetables and protein before starchy foods has been shown to raise GLP-1 and soften the rise in blood sugar after a meal.⁹ (See Balancing the Sugar Seesaw.)
• Protein at every meal. In one trial, a small serving of whey protein before breakfast increased GLP-1 and lowered blood sugar after the meal.¹⁰
• Bring back bitterness. Bitter taste receptors in the gut are linked with the release of satiety hormones. Rocket, chicory, radicchio and dandelion leaves are easy ways in. (See Bitter Is Better.)
• Sleep and calm. Short sleep and chronic stress drive hunger and cravings, whatever else we do. (See The Cortisol Clock.)

You may see the plant compound berberine sold as "nature's Ozempic". It has encouraging research for blood sugar and cholesterol,¹¹ but it is not a natural equivalent of the injections, it doesn't suit everyone, and it interacts with a number of medicines. Please speak to a qualified practitioner rather than self-prescribing.

At Rootwise, we support people on every path: those taking weight-loss injections who want to protect their strength and nutrition, those preparing to come off them, and those looking for a natural route. We look at the whole picture, from digestion and blood sugar to stress and sleep, so that the weight you lose is fat, not health.