Are Prawns Syn Free On Slimming World? How Many Syns In Prawns? Find Out Here!

Updated on 
1 February, 2023

How Many Syns In Prawns? Can I Eat Prawns On Slimming World?

If you're a lover of seafood, and prawns, in particular, you might be curious about their syn value in the slimming world, are they syn free on the plan?

Can I Eat Prawns On Slimming World?

Prawns are indeed syn-free on slimming world meaning you can have as much of them as you want without having to track any syns in them.

Down below, we've discussed in more detail if prawns are good for weight loss, which prawns are not syn free, other syn free seafood and two SW recipes using prawns down below.

Are Prawns Good For Weight Loss?

Since prawns are syn-free, this means you can have as many of them as you want on the plan without having to track any syns. Prawns themselves are a great source of protein on this plan and are very low in calories and fat too, having just 5 syns for 85g and 0.5g of fat for a two-ounce serving.

Which Prawns Are Not Syn Free?

Since prawns are syn free, it can be confusing to learn that this doesn't mean all types of prawns you buy from the supermarket are syn-free. For example, any marinated packs of prawns, flavoured or prawn cocktails will have syns due to the added ingredients or oil content, for example, a pack of marinated king prawns from Tesco has 6.5 syns a serving.

We've listed some examples of syns in some prawn dishes down below.

  • Tesco Finest Prawn Cocktail 170G - 12.5 syns.
  • Tesco Lemon & Garlic King Prawns 150G - 3.5 syns.
  • Tesco Raw Chilli & Lime Marinated King Prawns 200G - 6.5 syns.
  • Aldi The Fishmonger Reduced Fat Prawn Cocktail 170g - 5.5 syns.
  • Tesco 12 Salt & Pepper Prawns 132G - 1.5 syns.
  • M&S King Prawns with Creamy Cocktail Sauce 110g - 11.5 syns.
  • Tesco Healthy Living Prawn Cocktail 170G - 6 syns.
  • Tesco 12 Hot & Spicy Prawns 132G - 1.5 syns.
  • Tesco Chilli & Lime King Prawns 150G - 3 syns.
  • Tesco Tempura Prawns 200G - 11 syns.
  • Sainsbury's Be Good to Yourself Prawn Cocktail 170g - 5.5 syns.

Other Syn Free Seafoods

If you are someone who loves seafood, you will be pleased to know there are plenty of other syn-free types on the plan to check out too.

  • Caviar
  • Cod Roe
  • Seafood or Crab Sticks
  • Kippers
  • Mackerel (Unsmoked) fresh/canned in brine/tomato sauce
  • Salmon, fresh/canned/smoked
  • Sardines, canned in brine/tomato sauce
  • Tuna, canned in brine or spring water
  • Tuna, Fresh
  • Clams
  • Trout, Fresh or Smoked
  • Crayfish
  • Cuttlefish
  • Lobster
  • Mussels
  • Haddock, Plain or Smoked
  • Oysters
  • Scallops
  • Shrimps
  • Cockles
  • Cod, Plain or Smoked
  • Lemon Sole
  • Plaice
  • Pollock
  • Sea Bass
  • Tilapia
Other Syn Free Seafoods

Our Best Prawn SW Recipes

Now we know that prawns are syn-free on the slimming world plan, you will be happy to know there are plenty of slimming world recipes you can make with them too!

We've listed two syn free SW prawn recipes for you to try out at home this week for dinner.

Prawn & Veggies Rice


  • One cup of basmati.
  • 300g of prawns.
  • One courgette, one red pepper, one carrot, and one onion diced.
  • Cup of edamame beans.
  • Two crushed garlic cloves.
  • One large pinch of paprika.
  • Two pinches of cumin.
  • A teaspoon of turmeric.
  • Two cups of chicken stock.
  • Coriander.
  • Low cal cooking spray.


  1. Start by frying off all of your veggies then add the garlic, a splash of stock and your spices into the pan. Add in your rice and edamame beans, pour in all of the stock and bring to a boil, reduce to low heat.
  2. Add in the prawns for the last 5 minutes of cooking time, and leave the lid on for eight minutes after cooking.

King Prawn Pasta


  • Two red peppers and one yellow pepper chopped.
  • One onion chopped.
  • Three garlic cloves chopped.
  • Pinch of paprika, oregano and chilli flakes.
  • One can of chopped tomatoes.
  • Three spoons of tomato paste.
  • 400g of linguine pasta.
  • One veg stock cube.
  • 200g of cherry tomatoes.
  • 400g of king prawns.


  1. Spray a frying pan over medium heat then add in the peppers and onion, stirring for around 10 minutes.
  2. Add in all the other ingredients except the tomatoes, prawns and pasta, stir in 300ml of water and simmer for around 20 minutes.
  3. Cook your pasta, then add the tomatoes and prawns to the sauce, cook for a further 15 minutes until the prawns are cooked through and enjoy over pasta!
Our Best Prawn SW Recipes

Last Words

To conclude, prawns are syn-free in the slimming world, and are also low in fat and calories, making them a great high protein snack or a main part of dinners and lunches. Avoid using prawns marinated or with other ingredients like prawn cocktails since these add sneaky syns.

Jennifer is a certified nutritionist and weight loss coach with a Master's in Nutrition from Cambridge. With over 10 years experience, she shares healthy recipes and science-backed slimming tips on SheCooksSheEats to help people reach their wellness goals. Jennifer stays up-to-date by regularly attending conferences and continuing her nutrition education. She aims to provide research-backed advice to inspire balanced, happy living.
View Bio

Related Articles

Leave a Reply

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

crossmenuarrow-leftarrow-right linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram