Weight loss at Christmas is extremely difficult especially when considering how many calories there are in all of Britains favourite treats. Slimmers know that the key to successful weight loss is being in a calorie deficit, so diet expert, Terri-Ann Nunns, has shared the top five treats that Britons can indulge in during this festive period that can be burnt off in 20 minutes or less of exercise - what are they?

Slimmers all know that the key to achieving successful weight loss is getting into a calorie deficit and a new study conducted recently by the Royal Society for Public Health suggested that labelling junk food with the amount of time it would take to burn off could help people nationwide to eat 200 calories less every day.

Many slimmers might be horrified to learn that a tub of Ben & Jerrys ice-cream could take up to four hours and 40 minutes of walking to burn off the calories, but luckily, slimmers can still eat some of Britains favourite treats which can be burnt off in under 20 minutes of exercise - what are they?

Terri-Ann Nunns, diet expert and founder of theTerri-Ann 123 Diet Plan, has shared the top five tasty snacks that can be burnt off in under 20 minutes of exercise.

READ MORE:Man loses175lbsusing 'life-changingdiet plan

1. Cadbury Dairy Milk Chocolate Buttons (30g)

Its definitely a myth to think that you cant enjoy chocolate as part of a healthy balanced diet, said Terri-Ann Nunns.

If you are craving a chocolate fix, opt for something small but satisfying such as a packet of Cadbury Dairy Milk Chocolate Buttons (30g).

It wont damage your calorie intake too much and can easily be burned off.

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Number of calories: 160

According to Nunns, there are three different exercises that a slimmer can do to burn off the calories from the Cadbury Dairy Milk Chocolate Buttons.

How to burn it off in under 20 minutes:

- Go jogging for 19 minutes

- Swim for 13 minutes

- Circuit training for 17 minutes

2. Digestive Biscuits (x2)

Opting for a biscuit with a cup of tea is a classic mid-afternoon snack and if you can stick to just two Plan Digestive Biscuits, youll be in a position where you can easily burn them off and still feel like youve had a treat, explained Nunns.

Number of calories: 100

Nunns recommends walking, zumba, or most surprisingly, gardening to burn off the calories from eating two Digestive Biscuits.

How to burn it off in under 20 minutes:

- Walking for 13 minutes

- Zumba for 9 minutes

- Gardening for 19 minutes

3. Walkers Cheese and Onion Crisps

Like chocolate, theres no reason that crisps cant be part of a healthy diet as long as they fall within your daily calorie allowance and arent consumed too frequently, explained Nuunns.

A packet of Walkers Cheese and Onion Crisps isnt as damaging as you might think and can be burned off in under 20 minutes.

Similarly as with the other two treats, calories from Walkers Cheese and Onion Crisps can be burned off in under 20 minutes by participating in light exercise.

Number of calories: 130

How to burn it off in under 20 minutes:

- Walk up the stairs for 15 minutes

- Run for 14 minutes

- Go on a bike ride for 17 minutes

4. Butterkist Toffee Popcorn (20g)

If youre heading to the cinema or have a sweet craving you might grab a bag of popcorn as a snack, said Nunns.

Luckily popcorn is a surprisingly low-calorie snack and its made from whole grains a really important part of any diet, explained the diet expert.

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Weight loss: Five tasty treats you can burn off in under 20 minutes of exercise - Express