David Saunders
The weight loss jab conversation is no longer a niche chat in clinic waiting rooms. It’s heading for the mainstream, fast. A recent YouGov poll for the National Pharmacy Association found that the number of UK adults using weight-loss injections in 2026 is set to increase to 3.3 million — up from 1.5 million last year. That’s a lot of people discovering, sometimes abruptly, that a smaller appetite doesn’t automatically equal better nutrition.
So, in the spirit of avoiding a health kick that turns into a wobble, nutrition experts at healthy meal prep delivery service Prep Kitchen (which offers weight loss meal plans) have shared practical guidance to help Brits stay safe, fuel properly and manage side effects while using Ozempic.
What is Ozempic, and why does it affect appetite?
Ozempic is a prescription-only drug that is primarily administered to help manage type 2 diabetes. It should only be used with medical advice and a prescription from your doctor.
Ozempic contains semaglutide, a compound mimicking a natural hormone called GLP-1 (glucagon-like peptide-1). GLP-1 plays a key role in weight management by slowing down the passage of food from the stomach, helping to maintain a feeling of fullness after eating.
It also works in the brain on the signals that control appetite, so it encourages people to eat less often and to need smaller meals.
Additionally, Ozempic inhibits glucagon, a hormone produced by the pancreas that signals the liver to release glucose (sugar) into the bloodstream. By reducing this release, Ozempic helps prevent spikes in blood sugar levels, which may lead to sugar cravings.
In plain English: the medication can make you feel fuller sooner, for longer. Helpful, yes — but it also means it’s easier to under-eat, under-drink, and accidentally under-nourish.
The top safety tips if you’re using a weight loss jab
Prep Kitchen’s experts boil it down to four non-negotiables — the kind of basics that don’t trend on social media, but quietly do the heavy lifting.
- Follow a balanced, nutrient-rich diet: Focus on non-starchy vegetables, whole grains, lean proteins (chicken, fish, legumes), and healthy fats (avocados, nuts, olive oil) to support blood sugar stability, satiety, and overall health.
- Monitor caloric intake wisely: Eat enough calories to prevent muscle loss and maintain energy, while creating a sustainable deficit if weight loss is the goal.
- Manage side effects proactively: Mitigate side effects such as nausea, diarrhoea, or constipation by staying hydrated, eating whole foods, avoiding greasy meals, and adjusting fibre intake as needed.
- Hydration is essential: Regular water intake helps prevent dehydration caused by side effects or reduced appetite and supports overall well-being.
If you’re expecting something sexier than “drink water and eat vegetables,” I’m afraid the human body remains stubbornly traditional.
What a balanced diet looks like on Ozempic
Maintaining a healthy diet while taking Ozempic helps to aid the medication’s positive effects. A balanced meal plan includes nutrient-rich foods and focuses on consuming the right proportions of macronutrients:
Carbohydrates
Focus on non-starchy vegetables and whole grains to maintain stable blood sugar levels and avoid the peaks and troughs that cause sugar cravings.
Proteins
Incorporate lean protein sources such as chicken, fish, and legumes to support muscle health and promote feelings of fullness.
Fats
Choose healthy fats like oily fish, avocados, nuts, and olive oil while avoiding high-fat processed foods, which may increase the risk of gastrointestinal discomfort.
This is where many people using a weight loss jab get caught out: appetite falls, meals shrink, and suddenly protein becomes a “nice-to-have” rather than a daily plan. Your muscles will not applaud that decision.
Calories on Ozempic: enough still matters
For effective weight management while on Ozempic, it’s important to monitor your daily caloric intake. While the focus is typically on reducing the number of calories eaten, it is equally important to ensure that enough calories are consumed to provide the right levels of nutrients, help prevent muscle loss, and ensure adequate energy levels.
Setting caloric goals
- Determine a weight loss target: If you intend to lose a significant amount of weight or have any health conditions, it is recommended to consult with your doctor and a dietitian or other qualified nutrition professional for guidance.
- Calculate your daily caloric needs: Base your caloric intake on age, gender, activity level, and weight loss objectives. Tools such as calorie calculators can help determine these targets.
- Create a sustainable calorie deficit: For weight loss, aim for a calorie deficit that is manageable long term to avoid extreme hunger or fatigue.
The goal isn’t to eat “as little as possible.” It’s to eat enough to keep energy steady, digestion workable, and muscle on your side while the weight loss jab helps reduce appetite.
Foods to include (and avoid) while taking Ozempic
The best foods to eat while on Ozempic are those that support your individual health goals and work with the action of the medication. For example, when the drug is prescribed for weight loss, it’s typically used in combination with a calorie-controlled diet, and when used for diabetes management, the diet should be designed to help regulate blood sugar.
Foods to include
- High-fibre foods: Incorporate fruits, vegetables, and whole grains to support digestion, promote fullness, and maintain stable blood sugar levels.
- Lean proteins: Include sources like poultry, fish, and plant-based proteins to support muscle maintenance and satiety.
Foods to avoid
- Processed foods: Limit intake of processed and high-fat foods to prevent gastrointestinal discomfort, overconsumption, and support stable blood sugar levels.
- Added sugars: Avoid foods with high added sugar content to reduce the risk of blood sugar spikes, which may counteract the effects of Ozempic.
If Ozempic has already dialled down hunger, ultra-processed foods can still sneak in calories without delivering much nutrition — and they’re more likely to aggravate the stomach when you’re on a weight loss jab.
Managing side effects: nausea, diarrhoea and constipation
While taking Ozempic, some individuals may experience side effects such as nausea, diarrhoea, constipation, or other gastrointestinal issues. To mitigate these effects, it’s recommended to consume a diet rich in whole foods, stay hydrated, and avoid overly processed or greasy meals.
Increasing your fibre intake can be a good idea to support your good gut bacteria and overall digestive health, though if you find your symptoms get worse after eating certain foods, it can be worth keeping a food diary.
This isn’t about suffering through it. It’s about noticing patterns early, keeping things simple, and not letting side effects dictate the entire day.
Hydration: the quiet deal-breaker
Because it may cause gastrointestinal upsets, Ozempic might also affect hydration levels in some people. People experiencing nausea as a side effect might find they don’t want to eat or drink as much as they should.
As well as nausea, if you experience ongoing diarrhoea as a side effect of Ozempic, this can also cause dehydration as you’re constantly losing fluids. Consequently, it is important to monitor your symptoms and keep an eye on your fluid intake when you’re on Ozempic.
Hydration is the least glamorous tip here — and the one most likely to stop a weight loss jab plan from derailing due to headaches, fatigue, constipation, or that general “I feel off” fog.
Expert take: a balanced approach that actually holds up
Kerry Beeson, Nutritional Therapist at Prep Kitchen, concludes: “Staying healthy while taking Ozempic involves a balanced approach to diet and lifestyle. By focusing on nutrient-dense foods, maintaining a proper caloric intake, and managing potential side effects, individuals can optimise their health and achieve their weight management goals.
Consider subscribing to a healthy meal prep subscription, which can make it easier to monitor your calories, eat a nutritious diet, and support your weight loss goals.”
FAQs
What should you eat on a weight loss jab like Ozempic?
Focus on non-starchy vegetables, whole grains, lean proteins (chicken, fish, legumes) and healthy fats (avocados, nuts, olive oil) to support satiety and stable blood sugar.
Do you need to count calories on Ozempic?
You may not need to micromanage daily numbers, but monitoring intake can help ensure you’re eating enough to prevent low energy and muscle loss while creating a sustainable deficit.
How do you reduce nausea or constipation on Ozempic?
Hydration, whole foods, avoiding greasy meals, and adjusting fibre intake can help. If symptoms persist or worsen, speak to your prescriber.
Why is protein important when appetite drops?
Lean protein supports muscle health and helps you stay fuller for longer — particularly important if a weight loss jab reduces meal size and frequency.
Editorial Guidance
Ozempic is prescription-only and should only be used under medical guidance. If you have significant side effects, dehydration symptoms, or difficulty eating/drinking, contact your GP or prescriber.
