A tax on sugary drinks could prevent 3.7 million cases of obesity in the UK over the next decade, according to a report.
The figures will increase pressure on the Government over its strategy on childhood obesity, which is due to be published in the next few weeks.
Cancer Research UK and the UK Health Forum calculated that a 20 per cent tax on sugary drinks could reduce obesity rates in the UK by 5 per cent by 2025.
This is equal to 3.7 million fewer obese people - the combined populations of Birmingham, Leeds, Sheffield, Manchester, Bristol and Leicester.
The report also predicts that a sugar tax could save the NHS about £10 million in healthcare and social care costs in 2025 alone.
Several charities and high-profile campaigners, including celebrity chef Jamie Oliver, are calling for a sugar tax as part of a range of measures to cut obesity and the amount of sugar in children's diets.
Alison Cox, Cancer Research UK's director of cancer prevention, said: “The ripple effect of a small tax on sugary drinks is enormous. These numbers make it clear why we need to act now before obesity becomes an even greater problem.
“There are a lot of things working against us when it comes to making healthier choices. We're all bombarded by junk food advertising of cheap foods packed with extra calories and it can be tough for parents to do what's best for their children.
“The Government has a chance to help reduce the amount of sugar consumed by adults and children and to give future generations the best chance of a healthier life.”
Being overweight or obese can lead to many health problems, including cancer, Type 2 diabetes, heart disease and stroke.
Cancer Research UK is calling for a tax on sugary drinks, a ban on junk food adverts on TV before the 9pm watershed, and new targets for reducing the amount of fat and sugar in food.
Jane Landon, deputy chief executive of the UK Health Forum, said: “Countries which have introduced a tax on sugary drinks have not only reduced consumption, they have raised much-needed revenues for public health measures.
“These figures indicate that even a modest tax at 20 per cent - as part of a society-wide response - could help to deliver the scale and pace of change needed to turn around the UK's crisis of obesity-related ill-health.”
Earlier this month, a Cancer Research UK poll found that three-quarters of adults supported a ban on junk food advertising before the 9pm TV watershed.
Some 74 per cent would back a ban while 55 per cent also wanted a tax on sugary drinks.
Current estimates for school-age children are that 14.7 per cent of their calorie intake is made up of sugar.
The main sources of sugar include soft drinks, table sugar, confectionery, fruit juice, biscuits, buns, cakes, pastries and puddings and breakfast cereals.
Soft drinks (excluding fruit juice) are the largest single source of sugar for children aged 11 to 18. They provide 29 per cent of daily sugar intake, on average, for this age group.
A third of 10 to 11-year-olds and more than a fifth of four to five-year-olds in England are overweight or obese.
Barbara Dinsdale, lifestyle manager at the charity Heart Research UK, said: “This report illustrates loud and clear the huge impact that a 20 per cent sugar tax - as one part of a wider range of activities - can have.
Six healthy breakfast recipes - in pictures
Six healthy breakfast recipes - in pictures
You will need: 1 onion, 1 red pepper, 1 stick of celery, 1 cup of mushrooms, 4 to 6 eggs, 1 habanero chilli (optional), 1 tablespoon of oil, 25g of grated low-fat cheese, 150 ml of skimmed milk, 50g of turkey breast. Add some spinach for an extra boost.
Method:1) Cook your turkey breast so that it’s ready to add to the mix later on. Best to grill it and then chop it up as it’s healthier than shallow frying. 2) Meanwhile, heat the oil and add your onion, pepper, chilli, mushrooms and celery to your pan. Cook these for around five minutes until your veg is nice and soft. 3) Whisk your eggs and milk together in a separate bowl, seasoning with salt and pepper. 4) Add the egg mixture, veg, cooked turkey and cheese to a high-sided baking pan or tin and cook in your oven for around 15 minutes at 170C.
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Be careful when you buy your porridge, as some brands will cram a lot of sugar in there. Porridge is a good breakfast option as it is renowned for releasing energy slowly, which means you can get to lunch without suffering from a lull. A great source of fibre, potassium and vitamins, bananas are always a good accompaniment to your morning oats.
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Ingredients: 2 full eggs, 3 egg whites, asparagus, peppers, 50g of smoked salmon
Method1) Boil your asparagus in water for around five minutes. 2) Meanwhile, mix your eggs and egg whites in a jug, and add a splash of skimmed milk. Chop some peppers up and throw them in too. 3) Once your asparagus is cooked, drain it and chop into smaller chunks. Add these to your egg mixture. 4) Whisk your mixture and season with salt and pepper. 5) Pour the mix into a hot pan with a small knob of butter or a teaspoon of quality olive oil. 6) Cook the omelette for around 90 seconds to two minutes. 7) Once the bottom is cooked, take the pan off the hob and place under the grill for another 30 seconds to a minute in order to cook the top. 8) Serve with your smoked salmon.
Greek yoghurt has vast nutritional benefits. Regardless of where you stand on the superfood debate, Greek yoghurt’s credentials speak for themselves. A good source of potassium, protein, calcium and essential vitamins, this food forms an ideal base for a healthy breakfast, especially if you’re trying to lose weight.
Eggs Florentine is not only a tasty breakfast, it also carries a hefty nutritional punch, particularly when you throw some spinach into the equation.
So fast and easy to make, yet so effective. Wholemeal toast can be a good breakfast choice, as long as you are sensible with your toppings. Peanut butter is perfect. A good source of “healthy fats”, as well as protein and Vitamin E among other nutrients, a liberal spreading of peanut butter can set you up for the day.
“Whatever it takes to help wean consumers off highly sweetened and energy dense products - contributing to the overconsumption of calories - can only have a positive effect on individuals and the health of the nation.”
Gavin Partington, director general of the British Soft Drinks Association, said: “The hypothetical claims made in this modelling study run contrary to real-world evidence. In fact, the soft drinks tax in Mexico has reduced average calorie intake by six calories per person, per day with no evidence that it has reduced levels of obesity.
“The most comprehensive study into tackling obesity, from the McKinsey Global Institute 2014 report and Public Health England, found that a tax would be much less effective than reducing portion sizes and reformulating products.
“These are steps that our industry is already taking and as a result has reduced calories by 7.5 per cent since 2012 with plans to reduce a further 20 per cent by 2020.”