Fast 800 diet: How YOU could lose up to a stone in three weeks

Fast 800 diet: How YOU could lose up to a stone in three weeks with Dr Michael Mosley’s delicious calorie-limited meal plans

  • Dr Michael Mosley wrote The Fast Diet in 2012 but has made new routine easier
  • New plan you can fast track diet and spend two weeks on 800 calories a day 
  • Or you can spend two days in each week ‘fasting’ on 800 calories, then eat an abundance of delicious Mediterranean-inspired food on remaining five days 

Whether you were waiting for New Year to really galvanise yourself into losing weight, or you’re under doctor’s orders to shift a few pounds, my NEW 5:2 could be just what you need.

When I first wrote The Fast Diet with journalist Mimi Spencer, back in 2012, millions around the world fell in love with the idea of losing weight by ‘being good’ for two days a week and eating normally the rest of the time. 

Many people found it easier to diet this way, rather than with the standard ‘slow and steady’ method.

Dr Michael Mosley first wrote The Fast Diet in 2012 but has now made some changes to the 5:2 plan to make it easier to stick to

I originally put together the 5:2 diet after talking to scientists about the potential health benefits of intermittent fasting. 

I decided for five days a week I would eat healthily, and on my two fasting days I would cut down to 25 per cent of my normal intake — around 600 calories a day (500 calories for women, who have lower daily calorie needs).

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I was amazed by how effective 5:2 proved to be. I think one of the main reasons people swear by it is down to its flexibility. Unlike many other diet plans, you don’t have to give up eating lots of food groups (such as carbohydrates) or buy expensive ingredients. In fact, it will save you money!

This early version of the 5:2 diet was, I think, pretty good. However, the science of nutrition and health doesn’t stand still, and over the past six years there has been a wealth of fascinating new research into different forms of fasting and intermittent dieting.

On the new plan people can choose whether to fast track the diet and spend two weeks (or more) on 800 calories a day, or ease in more slowly instead (file picture)

That’s why I’ve made some changes to my original 5:2 plan to make it easier to stick to. It also gives the option to start it with a fast-track 800-a-day regime. Follow it and hopefully you’ll boost your mental and physical health, as well as lose a few inches from your waistline.

In Saturday’s Mail, I launched The Fast 800 diet with a 32-page magazine packed with tasty, healthy recipes, many created by my wife, Dr Clare Bailey. Today, I will focus on the core 5:2 element of my new, improved plan.

Every day this week I will reveal more about the health benefits of the multi-faceted approach of my Fast 800 plan, featuring nutritious recipes created exclusively for Mail readers.

A whole new 5:2

As I explained in Saturday’s magazine, on my new plan you can choose whether to fast track your diet and spend two weeks (or more) on 800 calories a day, or ease in more slowly instead.

If you choose the 5:2 route, you will pick two days in each week to ‘fast’ on 800 calories, then eat an abundance of delicious Mediterranean-inspired food on the remaining five days.

So what happens when you start fasting? 

During the first 24 hours of a fast, big changes occur inside your body. 

Within a few hours, the levels of sugar (glucose) circulating in your blood will begin to fall. 

When it’s not replaced by food, your body will start looking for energy in the form of glucose that is stored in your muscles and liver, called glycogen.

But once stores of glycogen begin to run low (around ten to 12 hours after your last meal), your body switches into fat-burning mode. 

It’s called ‘flipping the metabolic switch’. When this happens, fat is released from your fat stores and converted into fatty acids and ketone bodies.

This process is called ketosis. Your brain will use these ketone bodies as a source of energy. 

The longer you can avoid sugar and cut back on carbohydrates, the longer you should be able to preserve this ketogenic fat-burning state — that’s why many of my recipes in this series are lower in carbohydrate than you might expect.

The key to both approaches is the idea of consuming 800 calories, which studies have shown is just the right amount to trick your body into a fasting state, without being so low you end up wishing you weren’t dieting at all.

On your ‘fast’ days, you just need to keep an eye on your calorie intake. You can choose to have either three small meals per day or two larger ones (skipping breakfast or dinner) as long as the total calories add up to 800.

I’m also urging you to try Time-Restricted Eating (TRE), where you eat within a shorter time window. 

Studies also show if you extend your night-time fast to 12 hours or longer, and crunch your eating time into fewer hours, you can reap even more of the health benefits of intermittent fasting.

So, if you start on the fast-track 800 calories a day plan, I advise you eat those calories over a 12-hour window (say between 8am and 8pm) and then go 12 hours without food. Stick to the plan and you could lose up to a stone in three weeks.

But if you decide to do the NEW 5:2 and restrict your 800-calorie days to two days per week, I think it’s a good idea to apply a little extra TRE, and eat within a ten-hour window (say 8am to 6pm, or 11am to 9pm) on your fast days.

If it seems easier, this can mean skipping breakfast and enjoying two slightly larger meals rather than three small meals.

For the 800-calorie fast days, you can use the low-calorie recipes in this series. On other days, you can eat normally but healthily, sticking to a Mediterranean-style diet low in carbohydrates and refined sugars, without having to count calories. On this version of the plan, you could lose 1-2kg a week.

Safety first

Rapid weight loss used to be described as ‘crash dieting’, but the research now shows it can be safe and sustainable. In fact, people who lose weight quickly are more likely to keep it off.

You can stay in this fast-track phase for up to 12 weeks — but if you have any medical problems, check with your GP beforehand.

This diet is not suitable for under- 18s, or if you’re breastfeeding, pregnant or undergoing fertility treatment. Neither is it for those who are underweight, have an eating disorder or psychiatric disorder, have had recent heart problems or uncontrolled heart disease or high blood pressure.

Check with a doctor if you are unwell or recovering from significant surgery, or have diabetes, retinopathy or epilepsy.

Choose from these irresistible and nutritious recipes to kick-start your weight loss 


The poached eggs with mushrooms and spinach breakfast option contains 218cals

Poached Eggs with Mushrooms and Spinach

218 cals, Serves 1

  • 2 very fresh medium eggs, fridge-cold
  • 5g butter or 1 tsp extra virgin olive oil
  • 75g small chestnut mushrooms, sliced
  • 50g young spinach leaves

1. Take a medium saucepan a third full of water and bring to a gentle simmer. Break the eggs into two cups, then carefully tip them, one at a time, into the pan. Immediately take off the heat. Leave to stand for 4-5 minutes, or until the whites are set and the yolks remain runny.

2. While the eggs poach, melt the butter in a non-stick pan (or alternatively, use olive oil) and fry the mushrooms for 3-4 minutes, or until lightly browned.

3. Add the spinach and toss with the mushrooms until just beginning to wilt. Don’t over-cook or lots of liquid will be released. Season with pepper and a pinch of salt. Put the mushrooms and spinach on a plate. Drain the eggs with a slotted spoon and place on top. Season and serve.

Another breakfast option is eggs with spiced asparagus soldiers and the recipe serves two

Boiled Eggs with Spiced Asparagus Soldiers

230 cals, Serves 2

THIS fabulous light breakfast is full of flavour.

  • 250g asparagus spears
  • 4 eggs
  • 1 tbsp olive oil
  • Large pinch of ground cumin or smoked paprika

1 Cut or break off the woody ends of the asparagus and blanch the spears in a pan of boiling water for about 3 minutes. Drain, pat dry with kitchen paper and set aside.

2 Heat a pan of water to a rolling boil. Add the eggs and cook for 6-7 minutes for a soft yolk.

3 Meanwhile, heat a griddle pan on the hob. Toss the asparagus spears in the olive oil and sprinkle them with the cumin or paprika, salt and black pepper. Cook on the griddle for 3-4 minutes, turning a few times, until they are tender and slightly charred.

4 Serve the boiled eggs in egg cups, with the griddled asparagus on the side for dunking.

MORE SUBSTANTIAL: (Calories per person are shown.) Add a large handful of spinach, tossed for about 1-2 minutes in a non-stick pan until it wilts (insignificant calories; add 37 calories if you fry the leaves in 1 tsp butter, or 27 calories for 1 tsp olive oil). Or add a large handful of mixed salad (no extra calories, unless you add a dressing, such as olive oil and cider vinegar).

For a more unusual breakfast try the spiced stewed plums with yogurt and almonds

Spiced, Stewed Breakfast Plums

244 cals, Serves 2

  • 4 plums (about 275g), halved and stoned
  • 2 x 10-12cm strips orange zest, peeled with a vegetable peeler
  • Juice of 1 large orange (about 100ml)
  • ¼ tsp ground cinnamon
  • 100g full-fat Greek yoghurt
  • 15g toasted, flaked almonds

1 Put the plums in a saucepan. Add the orange zest and juice, 150ml water and cinnamon. Stir lightly.

2 Bring the liquid to a simmer, cover and cook over a low heat for 10-15 minutes, or until the plums are soft but holding their shape.

3 Serve warm or cold with Greek yoghurt and a sprinkling of toasted almonds.


Zingy avocado salad contains 240cals and is easy to make

Zingy Avocado Salad

240 cals, Serves 2

  • 210g can red kidney beans, drained and rinsed
  • 40g mixed salad leaves
  • 10 cherry tomatoes, quartered
  • 2 spring onions, trimmed and finely sliced
  • 20g bunch fresh coriander, leaves roughly chopped
  • 1 medium avocado, peeled, stoned and sliced (150g prepared weight)
  • 15g mixed seeds, such as sunflower, pumpkin, sesame and flax

For the dressing:

l Juice of 1 lime

l 2 tbsp extra virgin olive oil

l ½ tsp Dijon mustard

1 Toss the beans, leaves, tomatoes, spring onions and coriander together. Place the avocado on top.

2 Whisk the lime juice, oil and mustard together. Season with salt and pepper. Drizzle the dressing over the salad, sprinkle with the seeds and serve.

This twist on beans on toast requires cannellini beans and a selection of seeds

Spicy Baked Beans on Sourdough Toast 

246 cals, Serves 2

A WHOLE-FOOD, home-made, low-sugar beans on toast.

  • ½ tsp cumin seeds
  • ½ tsp coriander seeds
  • 2 tbsp olive oil
  • 1 small red onion, peeled and finely diced
  • 1 stick celery, finely diced
  • ¼ tsp ground turmeric
  • ¼ tsp paprika
  • 227g can chopped tomatoes
  • ½ tbsp balsamic vinegar
  • 1 x 400g can cannellini beans, drained and rinsed
  • 2 slices sourdough bread

1 Heat the cumin and coriander seeds in a medium, non-stick saucepan for 1-2 minutes to release their aroma, then add the oil and sauté the onion and celery for 2-3 minutes, until starting to soften.

2 Stir in the remaining spices and cook for 30 seconds more before adding the tomatoes, 150ml water and the balsamic vinegar. Simmer gently for 15 minutes, stirring occasionally.

3 Stir in the beans, add 1-2 tbsp water to loosen if needed and season to taste. Cook for 2-3 minutes more, or until the beans are hot.

4 Meanwhile, toast the bread. Serve the beans spooned over the slices of sourdough.

Another lunch possibility is dark rye bread with egg and spinach which contains 240 cals

Dark Rye Bread with Egg and Spinach

240 cals, Serves 1

  • 2 eggs
  • 1 tsp butter or olive oil
  • 2 handfuls of spinach
  • 1 slice rye bread, lightly toasted

1 Either poach the eggs in boiling water for 4 minutes or scramble them.

2 Meanwhile, melt the butter (or use oil) in a non-stick frying pan over a medium heat and add the spinach. Cook briefly, just until it wilts, then spoon onto the toast.

3 Place the eggs on top. Season to taste with a little salt and plenty of ground black pepper.

TIP: For extra flavour, add a few drops of Tabasco sauce or a pinch of cayenne pepper.


A low calorie dinner option is lemony chicken

Lemony Roast Chicken

410 Cals, Serves 2

  • 2 tsp extra virgin olive oil
  • 4 small chicken thighs (about 470g), unskinned
  • 1 medium red onion, cut into thin wedges
  • 1 medium red pepper, deseeded and cut into 3cm chunks
  • 1 medium yellow pepper, deseeded and cut into 3cm chunks
  • 1 medium courgette, halved lengthways and cut into 2cm slices
  • 2 vines of cherry tomatoes, each with roughly 7 tomatoes
  • Juice of ½ lemon

1 Preheat the oven to 200c/190c fan/gas 6. Brush a baking tray or roasting tin with a little of the oil and place the chicken thighs, skin-side up, onto it. Season with salt and pepper. Roast for 10 minutes.

2 Put the onion, peppers and courgette in a bowl and toss with the remaining oil. Season with pepper. Take the tray out of the oven and scatter the vegetables around the chicken. Roast for 20 minutes.

3 Take the tray out of the oven once more and add the tomatoes. Squeeze the juice of the lemon over the chicken and vegetables. Return to the oven for a further 10-15 minutes or until the vegetables are tender and lightly charred and the chicken is cooked .

4 Serve the chicken and vegetables with the lemony cooking juices spooned over.

The simple soy salmon and stir-fry veg recipe feeds two and is only 395cals

Simple Soy Salmon and Stir-fry Veg

395 cals, Serves 2

  • 2 tbsp dark soy sauce
  • 1 tsp sesame oil
  • ½ tsp dried chilli flakes (optional)
  • 2 x 125g salmon fillets
  • 4 spring onions, trimmed and cut into roughly 2cm lengths
  • 1 tbsp extra virgin olive oil

320g bag stir-fry vegetables or mix of prepared mangetout, shredded pak choi, sliced carrots, mushrooms and peppers

1 Preheat the oven to 200c/180c fan/gas 6. Line a small, shallow baking dish with kitchen foil. Mix the soy, sesame and chilli, if using.

2 Place the salmon fillets in the prepared dish or tin, skin-side down, and spoon over the soy sauce mixture. Scatter the spring onions over the top.

3 Season with ground black pepper and bake for 15 minutes or until the fish is just cooked through.

4 When the salmon has almost finished cooking, heat the olive oil in a large non-stick frying pan or wok and stir-fry the vegetables for 4-5 minutes, or according to the pack instructions.

5 Divide the vegetables equally between two warmed plates or bowls and top with the salmon. Spoon over the soy cooking liquor and serve.

There’s even a curry on Dr Mosley’s recipes and this vegan Rogan Josh, which serves four people, comes in at 310cals

Vegan Rogan Josh

310 cals, serves 4

YES, you can still enjoy curry . . . just skip the potato, white rice, naan and chapattis!

  • 3 tbsp olive oil
  • 2 onions, 1 chopped, the other sliced in rings
  • 300g butternut squash, peeled and chopped
  • 3 garlic cloves, sliced
  • ½ red pepper, deseeded and sliced
  • 200g portobello mushrooms, chopped
  • 400g tin chickpeas, drained
  • 2 tbsp rogan josh paste
  • 400g tin chopped tomatoes
  • Handful of kale
  • 2 tbsp fresh coriander, chopped

1 Heat the oil in a pan and fry the onion rings for 8-10 minutes or until golden and crisp. Remove from pan and set aside.

2 Using the same pan and oil, fry the chopped onions for 2-3 minutes. Add the butternut squash, garlic, red pepper and mushrooms and cook for a further 3-4 minutes.

3 Stir in the chickpeas with the rogan josh paste, followed by the tomatoes.

4 Cover the pan and let it simmer for 15 minutes, or until the vegetables are tender. Add water, if necessary, to loosen the sauce.

5 Stir in the kale and cook for 2 minutes, then add the coriander and season. Garnish with the onion rings and serve with Coconut Cauliflower Rice (Recipe to follow, add 105 cals).

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