• Home
  • Cultural Reviews
    • Dance
    • Exhibitions
    • Opera
    • Theatre
    • Outdoor
    • London Sights
  • Homes & Gardens
    • Cocktails
    • Homes and Gardens
  • Recipes
    • Meat
    • Starters
    • Lunch
    • Mains
    • Sides
    • Desserts
    • Cakes and Sweets
    • 5:2 Diet Recipes
    • Fish and Shellfish
    • Meat
    • Poultry
    • Vegetarian
  • Restaurants
    • Bloomsbury and Fitzrovia
    • Bermondsey, Borough and London Bridge
    • Chelsea
    • Camden
    • City of London
    • Clerkenwell
    • Covent Garden
    • Docklands
    • East London
    • Kings Cross
    • Knightsbridge
    • Kensington
    • Kings Cross
    • Marylebone
    • Mayfair
    • Oxford Circus
    • Oxford Circus
    • Paddington
    • St James
    • Soho
    • South Bank
    • South London
    • The Strand and Embankment
    • North London
    • Victoria and Pimlico
    • West London
    • Out of London
    • Miscellaneous
  • Travel Features
    • Travel UK
    • Travel Europe
      • France
      • Italy
        • Sicily
      • UK
    • Travel Asia
      • Thailand
    • Cruises
  • News

London Unattached

Cultural News and Reviews - London

You are here: Home / Recipes / 5:2 Diet Recipes / 5:2 Fast Diet Tips Part Two and Fish Pie

5:2 Fast Diet Tips Part Two and Fish Pie

December 14, 2012 (2012-12-14T12:02:23+00:00) by Fiona Maclean 17 Comments

Tweet
Pin
Share
Flip
Share

Last Updated on February 28, 2019

Tips for 5-2 Diet Fast Days and a Low Calorie 5-2 Diet Fish Pie.

The 5:2 Diet or Fast Diet has become very popular in the UK since Michael Moseley’s programme on Horizon.  For me, while there may be some secrets to intermittent fasting, the reason the 5:2 diet works and helps you lose weight, stay healthy and live longer is common sense.

5-2 fast diet fish pie

For two days a week (or more if you chose to try alternate day fasting), you need to think about what you are eating and keep your calorie count to under 500 for a woman and under 600 for a man.  That means you really can’t drink any alcohol and, if you want to avoid feeling very hungry you need to be careful about the food choices you make.  For me, at least, the result is that the next day cravings for sweets, alcohol and even chocolate(!) diminishes

A few tips to make life easier if you are trying to follow the 5:2 fast diet.

  • Drink plenty of black or green tea, herbal teas or water.  If you really don’t like them, then black coffee in moderation will be fine (or save  40 calories for some skimmed milk).  If you feel REALLY hungry, fizzy water or zero calorie fizzy drinks will temporarily work.
  • Keep packets of low calorie instant soup (I like miso soup) on hand.  They are generally around 50 calories but I find a cup of miso soup really does make me feel full.  I have friends following this diet plan who drink hot bovril for the same reason.
  • If you don’t normally eat breakfast (like me), then don’t do so on a fast day.  If you are a breakfast person, recommended ideas are a boiled or poached egg, porridge made with water or zero fat yoghurt with some fresh fruit.
  • If you plan on cooking rather than using ready meals (personally I find I can create much more filling dishes myself than those I buy in the supermarket), invest in 1cal oil spray and use that for stirfries, softening onions etc.  It’s very easy to add too much oil or butter to a dish and really raise the calorie count
  • Try substituting lower calorie ingredients for traditional ones so that you don’t have to stop eating your favourite dishes.  The fish pie below uses no butter in the white sauce and the mash is a mixture of celeriac and cauliflower.   It is light, tasty and very warming on a cold winter day.  In the same way, using venison instead of pork sausages and white fish instead of salmon will help keep the calories down.  And eat plenty of low calorie vegetables – steamed broccoli, cabbage, cauliflower, mangetout, asparagus and courgettes for example.
  • Remember, you only need to do this for two days of the week…for me, that’s what really helps me keep going.  I think the best diets are ones which can become a lifestyle – the 5-2 fast diet works for me in a way no other diet has to date.
5-2 fast diet fish pie cooked
Print
5-2 Fast Diet Recipe Fish Pie
Prep Time
20 mins
Cook Time
15 mins
Total Time
35 mins
 
Course: Main Dish
Cuisine: British
Servings: 4
Author: Fiona Maclean
Ingredients
  • 300 g Fish a mixture of smoked and fresh - I used haddock, smoked haddock and salmon
  • 1 Shallot
  • 4 Tomatoes skin removed and chopped
  • 40 ml Skimmed milk
  • 300 g Cauliflower
  • 300 g Celeriac Root
  • 1 teaspoon Cornflour
  • 1 tablespoon Low fat creme fraiche
  • 2 Bay Leaves
  • 20 g Parmesan or strong cheddar finely grated
Instructions
  1. Peel and cube the celeriac. Put in a pan of cold water with a little salt and bring to the boil. Simmer for 10 minutes before adding the cauliflower broken into florets. Cook for a further 5-8 minutes till the cauliflower is soft
  2. Drain the mixture and leave to dry a little with the lid off before mashing with a potato masher, or blitzing with a stick blender. Season with salt and pepper and leave to one side
  3. Put the fish into a pan with the milk and bayleaf and heat the milk to simmering point. Cook for a minute or two, then cover and take off the heat and leave for 5-10 minutes.
  4. Pre-heat the oven to 170c. Remove the fish from the pan and break into largish flakes
  5. Remove the bay leaves from the milk. Mix the cornflour with a little water or cold milk and add to the pan. Bring the mixture back up to the boil and cook for 4-5 minutes till thick and creamy. Take off the heat and add in the creme fraiche.
  6. Soften the shallot in a small pan sprayed with 1cal oil, then add in the tomatoes and reduce down by about a third.
  7. Make up the fish pies as one large pie (serves 4) or 4 small ones by dividing up the fish mixture, seasoning well with salt and pepper and then pouring over the sauce. Add a layer of tomato mixture and then top with the mashed celeriac and cauliflower
  8. Grate a little parmesan or strong cheddar on top of each pie and place in the oven for 15 minutes (individual pies) or 20 minutes for one large pie.
  9. Serve with steamed green vegetables.

This recipe cuts the calories of a traditional fish pie (around 500) down to under 300, depending on the mix of fish you use.   Mine was lovely wild fish from DelishFish in Scotland and I think using a good smoked haddock DOES make a lot of difference to how well this pie turns out.  Salmon is actually relatively high in calories, about 200 calories per 100 grams, so if you really need to keep the calories down low, use a different white fish (cod, hake or monkfish for example) or prawns instead (you shouldn’t need to poach the prawns, just add them into the fish mixture at the last minute).  It is genuinely delicious, the very light sauce binding the fish together with a topping that is actually rather tastier than potato mash in my view, makes for something quite special.

The method of making mash with celeriac and cauliflower mixed worked very well and I’m planning on trying a shepherds pie using the same mixture.  I wanted to reduce the calories in the mash down as far as possible while keeping a mixture that wasn’t too watery.  Because the mix is very light, you really don’t need to add cream or butter (though of course you could if you were not doing a 5-2 diet fast day).  The quantity I’ve given makes enough topping for four portions and works out at about 50 calories per portion.  By comparison, the same quantity of mashed potato by weight would be be a third more.

5-2 fast diet fish pie

I feel better and I hope look better from following the 5-2 fast diet for a few months.  I am not finding it hard to do, other than the occasional hunger pang.  I’m working on reducing the calories in some of my favourite recipes simply so that I can enjoy them myself on 5-2 diet fast days.  But some of them, like this one, are quite nice enough to eat anyway whether or not you are trying to lose weight.

Good luck to everyone who is also doing the 5-2 fast diet – do feel free to comment or add your own tips here.

Filed Under: 5:2 Diet Recipes, Fish and Shellfish Tagged With: 5-2 diet, 5-2 diet recipe, 5-2 diet tips, 5:2 diet, 5:2 diet recipe, fast diet, fish, fish pie, Low calorie, low calorie diet recipe

Fiona Maclean

About Fiona Maclean

An award winning London based freelance writer, Fiona's career started in arts administration, before working for a leading London restaurant group under restauranteur Laurence Isaacson on restaurant brands including The Ivy and Wheelers. With a music degree and an MBA, Fiona's passions include all types of music, food, restaurants, wine and travel and she has now reviewed over 400 restaurants for London-Unattached and written countless classical music and opera features. She is the Founder and Editor of London-Unattached and has written about food, wine and travel for other print and online publications including Metro, &London and Zing Magazine.

Contact Fiona@London-Unattached.Com

Comments

  1. Jason Tomas says

    December 31, 2017 at (2017-12-31T14:25:32+00:00)

    only 40ml of milk for the white sauce? Dont you mean 400ml??

    Reply
  2. Mary Ann says

    March 21, 2013 at (2013-03-21T16:51:21+00:00)

    Hi Fiona – A brand newbie from the States. I just did my first fast day yesterday and it was tough, but I’m so proud I made it. I didn’t plan well, so I went online today and found your website. It’s now in my favourites!! Thank you for this fish pie. I think my husband (who is not fasting) will equally find it enjoyable.

    Reply
    • Fiona MacleanFiona Maclean says

      March 21, 2013 at (2013-03-21T22:16:12+00:00)

      Thanks Mary Ann. We have a few facebook groups do let me know if you want any links because I personally find them very supportive and helpful!

      Reply
  3. Karen McDonald says

    January 15, 2013 at (2013-01-15T23:05:58+00:00)

    Hi Fiona, I have been doing the 5:2 diet for a few weeks now, getting results so will continue but always looking for new ideas on what to eat. Also it would be good to hear how other people are managing their diets. So if you can send me the facebook links that would be great .
    Thanks
    Karen

    Reply
    • Fiona MacleanFiona Maclean says

      January 16, 2013 at (2013-01-16T07:25:54+00:00)

      this is the largest of the groups I m in and this one https://www.facebook.com/groups/the52diet/ is very supportive, if a little bit smaller

      Reply
  4. Bron says

    January 14, 2013 at (2013-01-14T08:56:03+00:00)

    Thankyou for sharing some great tips and great recipes! We had a similar steamed thai fish tonight and I will try the pie tomorrow! Thankyou for all your time in putting this together. Bron, starting the 5:2 tomorrow!

    Reply
    • Fiona MacleanFiona Maclean says

      January 14, 2013 at (2013-01-14T09:13:53+00:00)

      good luck! there are quite a few support groups on facebook if you want to find others doing 5:2 let me know and I’ll post the links

      Reply
  5. Kerry says

    January 11, 2013 at (2013-01-11T13:59:55+00:00)

    Wondering what you mean by this: ” For me, at least, the result is that the next day cravings for sweets, alcohol and even chocolate(!)” Is part of the sentence missing? You mean you have a lot of cravings the next day?

    Reply
    • Fiona MacleanFiona Maclean says

      January 11, 2013 at (2013-01-11T14:21:28+00:00)

      I’m sure you realised that somehow a word had been dropped from the end of the phrase. I’ve corrected it now. I suspect it happened, along with the image error, when we transferred the site to a new theme last week

      Reply
  6. emma cella says

    December 28, 2012 at (2012-12-28T20:12:13+00:00)

    this might be better with a dash of Tabasco’!

    Reply
  7. Rebecca says

    December 18, 2012 at (2012-12-18T05:39:14+00:00)

    Awesome recipe! I commend you on your willpower – not sure if I could do it, especially this close to the holidays

    Reply
  8. michaela britton says

    December 17, 2012 at (2012-12-17T17:40:16+00:00)

    Oooh this sounds yummy. I love fish pie so think I’m gunna try this at the weekend x

    Reply
  9. Jan Jones says

    December 15, 2012 at (2012-12-15T16:32:15+00:00)

    how many calories is the fish pie?Im a newbie to 5:2.

    Reply
    • FionaMFionaM says

      December 15, 2012 at (2012-12-15T17:04:44+00:00)

      It depends on the proportion of fish you use. Salmon is around 200cals per 100g. while Haddock is half that. So, if you make this dish up using 300 grams of fish, split equally between the three varieties I’ve listed, the fish itself will account for around 100 calories per serving, the sauce around 50 calories and the topping a further 80-100 calories (e.g. 250 calories). The main calorie savings come from the topping of tomato and cauliflower and celeriac mash and from using a much lighter sauce for the fish than would be traditional.

      Reply
  10. stevie says

    December 15, 2012 at (2012-12-15T00:28:29+00:00)

    awesome ideas as usual. your photos are magical

    Reply
  11. ClinicalPosters says

    December 14, 2012 at (2012-12-14T17:21:45+00:00)

    I applaud your diet discipline but find it hard to warm up to the non-vegetarian meal plans (just as carnivores may balk at vegetarian meal plans).

    Reply
    • FionaMFionaM says

      December 14, 2012 at (2012-12-14T22:04:29+00:00)

      I don’t object to eating a vegetarian meal every so often. And a lot of the home made soups I make ARE vegetarian (and I think my most popular recipe on here is mushroom goulash!). But I like meat and fish too.

      Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recipe Rating




Follow Us

  • Bloglovin
  • Facebook
  • Instagram
  • LinkedIn
  • Pinterest
  • RSS
  • Tumblr
  • Twitter

About London-Unattached

  • Contact Us
  • Enquiries/PR
  • London Unattached Contributors
  • London Unattached Privacy Policy
  • Media Pack

Recently Published

  • KİD – Restaurant of the Month
  • Dance Umbrella 2026
  • Madeira Wine – A Beginner’s Guide
  • Ski resorts for a short break

Sign up for our Newsletter

Sunday Roast Restaurant Reviews and New Restaurant Openings

Check our feature on the best Sunday Roasts in London - read the guide: Tried and Tested Sunday Roasts

Find out more about the New Restaurants in London in our guide - updated monthly after we've found our recommendation: The Best New London Restaurants

Copyright © 2026 · London-Unattached.Com