Diet Celery Soup Recipe

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Last Updated on January 1, 2026

Low-Calorie Celery Soup – 5:2 Diet Celery Soup Recipe

I’m still doing a version of intermittent fasting called the 5-2 diet, despite all apparent appearances to the contrary. Some weeks, I find I don’t have 2 days when I can fast, but I try to balance that out on the weeks when I am less busy. And I am slowly losing weight. Luckily, I love the taste of vegetables like celery, and so I’ve been making a low-calorie celery soup for my diet.

Soup is my mainstay for lunch, and part of that is because I am still convinced by some research shown on the BBC a few years ago. The theory is that food in ‘liquid’ format will help you feel fuller for longer. Here’s a link to the original article

Celery soup is one of the most basic soup recipes. If you don’t add in the creme fraiche, it’s only 35 calories or so for a bowlful! You can add extra vegetables – I’ve tried celery and spinach, which is a lovely deep green mixture. In my recipe, I’ve used a small potato to thicken the mix, but you could use a little rice (25g dried weight) or pearl barley if you prefer. My choice of potato is determined by flavour and texture. I don’t find rice adds much flavour. Pearl barley will add a slightly nutty taste, and the consistency will be a little ‘gluier’ due to the starch levels. You could even add in cannellini beans if you want.

Print Recipe

5-2 Diet Celery Soup

A low-calorie celery soup suitable for the 5:2 Diet.

Diet Celery soup will fill you up if you are following a weight loss diet

Prep Time5

Cook Time35

Total Time40

Course: Lunch, Soup

Cuisine: British

Keyword: 5:2 diet, Celery, diet, intermittent fasting, low-calorie, soup

Servings:

Calories: 56kcal

Author: Fiona Maclean

Ingredients

6 Stalks Celery chopped
1 Small Onion Finely diced
1 Small Potato maximum 100g, peeled and chopped into small chunks
1 Stock cube
900 ml Water
1 tablespoon Low Fat Creme Fraiche
3-4 shots 1-cal oil spray

Instructions

Spray a heavy duty pan with 1-cal spray. Add the onion and soften over a moderate heat till translucent.
Add the celery and potato and cook for 2-3 minutes
Add the water and stock and bring to a gentle boil. Cook for 15 -20 minutes till the celery and potato is soft.
Blitz with a stick blender or process through a food processor.
Check seasoning and add salt and pepper to taste. Serve with a teaspoon of creme fraiche stirred through each bowl.

Notes

Serve this diet celery soup piping hot

Nutrition

Some people like their soup to have ‘bits’ in it. If that’s you, simply take out a large spoonful of chopped veg before you blitz the soup and return it to the pan once you are ready to serve. And, you can, of course, add in other veggies, though be warned if you put carrots in before you blitz the mixture the colour will be a bit dubious! The nutritional analysis is without the creme fraiche which will add 15 calories per teaspoon.

Anyway, this particular soup is one I made earlier (in true Blue Peter style). Tomorrow is another fast day and I have planned to make spicy tomato and lentil soup for lunch. I am expecting a veg and fruit box tomorrow so I don’t want to plan what I will eat in the evening though it will almost certainly be based on white fish or a chicken breast. One of the reasons the 5-2 diet and fast day planning works for me is because there’s a lot of flexibility in what and how you eat, so long as you keep to under 500 calories for a woman or under 600 for a man.

If you haven’t yet tried the 5-2 diet and would like to know more about it, please check out my 5-2 diet tips and leave a message on this post so I can link you to some of the excellent facebook support groups (all free). Do remember, I am not a recipe developer, these are simply the dishes I make for my own consumption.

Diet Celery Soup FAQ

What is this 5:2 diet celery soup?

This 5:2 diet celery soup is a light, low-calorie vegetable soup made mainly from celery, onion, a small potato, stock and a spoonful of low-fat crème fraîche. It’s designed as a filling, comforting soup that fits easily into an intermittent fasting or low-calorie eating plan.

How many calories are in a serving of this diet celery soup?

The recipe makes 4 servings at around 56 kcal per serving, including the low-fat crème fraîche. If you leave out the crème fraîche, a bowl is roughly 35 kcal, making it an extra-light option for fast days.

What are the main ingredients in the soup?

The soup is made from 6 stalks of celery, 1 small onion, 1 small potato (up to 100g), a stock cube, about 900ml of water, a tablespoon of low-fat crème fraîche, and a few sprays of 1-cal oil spray. These simple ingredients keep the calories low while still giving you a satisfying bowl of soup.

Is this diet celery soup suitable for the 5:2 diet or other weight-loss plans?

Yes. With around 56 kcal per serving, this soup is ideal for the 5:2 diet and other intermittent fasting or calorie-controlled plans. It’s mostly vegetables and water, with just a little potato and low-fat crème fraîche for body, so it’s a filling, low-calorie choice for fast days.

Is this celery soup vegetarian or vegan?

The soup can be vegetarian if you make it with a vegetable stock cube instead of meat stock. For a vegan version, use vegetable stock and swap the low-fat crème fraîche for a dairy-free alternative, or simply omit it for an ultra-low-calorie soup.

How should I store leftover diet celery soup?

Let the soup cool to room temperature, then transfer it to an airtight container and refrigerate. Properly stored, it will keep in the fridge for up to 3–4 days. Always reheat only the portion you plan to eat and discard any soup that has been left out at room temperature for more than 2 hours.

Can I freeze this celery soup?

Yes, this diet celery soup freezes well. Cool it completely, portion it into freezer-safe containers or bags, and freeze for up to 3 months. For best texture, you can stir in the crème fraîche after reheating rather than before freezing, but it will still freeze safely either way.

How do I reheat the soup safely?

Reheat the soup gently in a saucepan over a low to medium heat, stirring occasionally, until it is piping hot all the way through. You can also microwave it in a covered, microwave-safe bowl, stirring halfway through. Avoid repeatedly reheating the same batch – cool and store leftovers promptly and only reheat once.