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Home / Weight Loss / Foods to avoid on weight loss treatment

Foods to avoid on weight loss treatment

Learn more about good and bad foods whilst on weight loss meds

When starting weight loss treatment, what you eat can impact your results. However, with so many diet plans and recommendations, it’s hard to know where to begin.

Young woman looking disgusted at a doughnut.

If you take a weight loss drug like Saxenda, Ozempic, Wegovy, Mysimba or Orlistat, you must eat a low-calorie and balanced diet. That means you have to eat less of certain foods and prioritise others.

Keep reading to learn more about what to eat and what to avoid.

Why is your diet important during weight loss treatment?

You may wonder why you need to change your diet on weight loss treatment. The medication does it all for you, right? Wrong.

Weight loss medication can help you lose weight, but you need to have a healthy lifestyle to see the best results. Most treatments make you feel less hungry. But if you keep eating unhealthy foods, you will not lose as much weight.

Your diet can not only affect your weight, but it can also cause other health conditions. For example, eating too many fatty foods can lead to high cholesterol.

Lifestyle changes are a huge part of taking all weight loss medications and will ensure you reach your weight loss goals.

What foods should I avoid during weight loss treatment?

There are some foods that you should eat in moderation. This is because these foods don't have a lot of nutritional value or they are high in calories.

Foods to avoid on weight loss treatment

Fatty foods

Foods that are high in fat are one of the biggest components of a high-calorie diet.

Fat is essential in a healthy diet. It helps the body absorb vital vitamins, gives your body energy and produces important hormones. However, if you eat too much fat, your body can’t use all of it. So, your body converts it into body fat and causes weight gain.

Array of fast food on a wooden table.

There are good and bad fats. The bad fats, known as trans or saturated fats, are higher in calories and therefore are the ones to eat in moderation.

Unfortunately, a lot of our favourite foods are high in ‘bad fats’, including:

  • fatty cuts of meat (e.g. steak, ribs and ground meat)
  • other meat products (e.g. sausages and pies)
  • savoury snacks (e.g. crisps and popcorn)
  • butter, ghee and lard
  • fried foods (e.g. french fries)
  • cheese
  • cream
  • chocolate, cakes and pastries

The NHS recommends that your should aim to eat no more than 30g of saturated fat if you’re a man and 20g if you’re a woman.

Sugary foods

The next food group you should eat in moderation is sugar. Sugars, or carbohydrates, are found in a variety of foods. Your body mainly uses it for energy, which is essential for daily life.

An array of sugary foods on a wooden table.

Sugars occur naturally in foods like bread, fruit and milk. These foods have other essential nutrients and are okay to eat regularly. However, other sugary foods contain free sugars. Free sugars are a type of sugar that is purposely added to food, rather than them occurring naturally.

While these foods are delicious, they are high in calories and not very nutritious. They are often referred to as empty calories.

Food high in free sugars includes:

  • honey, jams and syrups
  • fruit juices
  • chocolate, ice cream and sweets
  • pastries, cakes and biscuits
  • sugary drinks (e.g. cola and fizzy drinks)
  • sweetened coffee drinks

The NHS recommends that your daily sugar intake should not exceed more than 5% of your daily calorie intake which is around 30g a day for adults. That is no more than 100-125kcal per day based on the daily recommended calorie intake. However, it is estimated that adults eat roughly 40 -55g Trusted source British Nutrition Foundation (BNF) Professional Organization Go to source a day.

Salty foods

Salt in moderation is essential for kidney function, but too much can result in weight gain and heart problems.

Close up of person adding salt to a meal.

In the short term, eating too much salt can cause water retention which can add up on the scales. But, most processed foods that are high in salt are also high in calories. Therefore, eating a lot of these foods can hinder your weight loss efforts.

The main complication of eating too much salt is high blood pressure (hypertension). When you consume a lot of salt, more water is pulled back into your bloodstream. The heart then has to work harder to pump blood around your body.

Processed foods have the highest salt content, such as:

  • cheese
  • canned soups and vegetables
  • white bread, pastries and pizzas
  • biscuits, cookies and cakes
  • processed meats (e.g. sausages, bacon and ham)
  • sauces (e.g. gravy, ketchup and soy sauce)

Food labels will usually be colour coded based on their salt content. Food with red labels will have a higher salt content of approximately more than 1.5g per 100g. The recommended daily allowance of salt is around 6g (one level teaspoon). In the UK, it is estimated that people eat 2.4g Trusted source UK Health Security Agency Blog Government Source Public Health and Safety Go to source more than the daily recommended amount per day.


You should avoid alcohol on weight loss medication for several reasons.

Firstly, and like the other food groups on this list, alcohol can result in weight gain. It may be surprising because you can drink alcohol with a meal and not feel full. However, alcohol can have just as many liquid calories. For instance, one pint of a 5% beer has around 239kcal, which is equivalent to a standard chocolate bar.

Alcohol Calories per serving
Pint of 5% beer 239kcal
50ml glass of 17% cream liqueur 153kcal
175ml glass of 12% wine 133kcal
Double measure (50ml) of 40% gin 95kcal

So, cocktails are safe? Not always. While the spirits themselves are low in calories, cocktails often contain fruit juices, flavoured syrups and other ingredients that are high in sugar. A pina colada has over 200kcal.

Different types of alcoholic drinks set out on a bar.

Besides the calories, drinking alcohol whilst on any medication can increase the likelihood of side effects. Weight loss medications are no expectation. They can cause common side effects like dizziness, nausea and digestive problems. Alcohol can make these effects worse and make you feel more uncomfortable. It’s best to avoid alcohol for that reason, especially at the beginning of treatment.

What foods should I eat during weight loss treatment?

A low-calorie diet is crucial for success with weight loss medication. The daily recommended calorie intake should be around 2,500 - 2,000kcal depending on your gender. It’s okay to go off-track every once in a while, but you should focus on getting your calorie intake from the most nutritious foods.

Array of healthy food on a grey background.

Below are some of the foods you should prioritise in your diet:

  • Fruits and vegetables - They are the biggest part of a healthy diet. They are a good source of energy and provide you with a wide range of essential vitamins and minerals for a healthy lifestyle.
  • Healthy fats - You need unsaturated fat in your diet. These foods tend to be lower in calories and can reduce cholesterol levels. Oily fish (e.g. salmon and mackerel), vegetable oils, nuts and seeds are all healthier alternatives to saturated fats.
  • Lean protein - As well as fish, you should opt for low-fat and high-protein foods. Choose white meat like chicken or turkey. Alternatively, legumes and beans are good sources of lean protein for non-meat eaters.
  • Whole grains - Whole wheat bread, pasta, oats and grains are essential for a healthy diet. They are a crucial source of fibre, which helps with digestion, and slow-release energy throughout the day.
  • Seasoning - An easy way to make meals delicious without using a lot of salt is to add different flavours. Adding fresh herbs and spices can add a lot of flavour without the calories increasing.

There are also plenty of low-fat and low-sugar alternatives to your favourite foods, like cheese and fruit juices. Check the nutritional labels on your go-to foods and see where you can cut calories.

Meal plan for weight loss medication

If you’re struggling with ideas, here are some meal ideas to get you started.


  • Porridge (topped with berries and nuts)
  • Kale, tomato and poached egg on toast
  • Low-sugar granola or muesli
 Bowl of porridge topped with blueberries and almonds on wooden table.


  • Vegetable soup
  • Smoked salmon bagels (with low-fat cream cheese and cucumber)
  • Roasted veg & couscous salad
Two servings of a couscous salad.


  • Butternut squash curry (with coconut milk, spinach and lentils)
  • Teriyaki chicken
  • Baked cod (with roasted vegetables and new potatoes)
Baked cod with roasted vegetables in ceramic dish.


  • Low-fat fruit yoghurt or mousse
  • Chocolate chia pudding (topped with berries)
  • Blueberry oat muffins (sweetened with mashed bananas)
Oat muffins on a woven mat.


  • Rice crackers
  • Packs of nuts
  • Piece of fruit
Rice crackers topped with chopped vegetables

These are just a few ideas, get creative! The tastier food, the more you will enjoy eating healthily.

How do I improve my diet?

Changing your diet isn’t easy. But, some key ways will make it seem easier.

  • Calorie counting - Setting a calorie limit and sticking to it will be the most important component of weight loss. Whether you’re cooking or eating out, jot down your calories for the day on your phone or on an app to keep on track.
  • Skip the takeaways - Limiting the amount of food you eat out will also help you make healthier habits. While a takeaway option may sound healthy, it may have hidden calories or ingredients that could hinder your progress. Once in a while is okay, but try and keep it to special occasions
  • Meal plan - Planning your meals ahead of time will help you keep on track. When you make a meal, make multiple portions! Then, you won’t have to worry about cooking something new each day. It'll also stop you from snacking and make food shopping much easier.
  • Don’t restrict yourself - Over-restricting will lead to unhealthy habits. Allow yourself a treat every once in a while and don’t get hung up on a cheat day.

Remember, changing your diet is the first and biggest step! Be kind to yourself, especially whilst on weight loss meds.

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Medically reviewed by Dr. Caroline Fontana Written by our editorial team Last reviewed 02-05-2024
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