Nuts are often raved about in the health world as a good snack, this is because they are full of healthy fats and often high in protein which helps to keep you fuller for longer in between meals.
The syns in nuts vary according to the type of nut you choose, for example, peanuts have around 5 syns for 18g while walnuts have around 1 syn per nut!
We've discussed in more detail below if you can eat nuts in the slimming world, syn values of nuts and if nuts are good for weight loss in the slimming world.
Before we get into the syns of nuts on the slimming world plan, let's first discuss if you can eat nuts on the slimming world plan while still losing weight.
You can happily snack on nuts on the slimming world plan as long as your keep track of their syns, you have up to 15 syns on the plan that you can use while still losing weight, if you go over this allowance you are at risk of gaining weight.
We would be cautious when snacking on nuts however since they are very calorie dense for a small amount, therefore weigh your portion.
Nuts have varying syns according to the type you choose and the amount you are snacking on, we've listed some syns of these different kinds of nuts down below to help you stay on track.
Almonds are nutrient-dense but relatively high in syns, so it’s best to enjoy them in moderation if you’re following Slimming World. On average, a 30g portion of almonds contains around 8–9 syns, depending on the brand and preparation method.
Below are some popular UK almond products and their Slimming World syn values:
💡 Recipe tip: A small handful of chopped almonds can add crunch and flavour to a Slimming World-friendly salad or yoghurt bowl without going over your daily syn allowance.
Brazil nuts are high in healthy fats but also high in syns, so it’s best to enjoy them in moderation on Slimming World. Below are the average syn values for popular UK brands:
Tip: Keep portion sizes measured, as Brazil nuts can quickly add up in syns due to their calorie density.
Walnuts, like Brazil nuts, are among the highest-syn nuts in Slimming World. On average, 6 walnut halves contain around 7 syns, so it’s best to enjoy them in moderation. While they’re packed with healthy fats and nutrients, their calorie density means portion control is key if you want to stay within your daily allowance.
Walnut Syn Values by Brand (UK)
Peanuts are a popular snack, whether roasted, salted, or coated. On average, they contain around 5 syns per 18g, so eating about 50g would use up your full daily allowance of 15 syns. To stay on track, enjoy them in moderation and always check the packaging for exact serving sizes.
Slimming World Syn Values for Popular Peanut Products:
Monkey nuts are packed with protein and make a satisfying snack. However, they are relatively high in syns, with around 8 syns per 40g portion. This means you could enjoy up to two portions before using your full 15-syn daily allowance.
As mentioned above, nuts are a great source of healthy fats and protein, making them a nutritious snack. However, because they are calorie-dense, many people wonder if they can still enjoy nuts while trying to lose weight.
The answer is yes — you can include nuts in your diet when losing weight, provided you pay attention to portion sizes and preparation methods. Here are some tips for snacking on nuts while staying on track:
Nuts are naturally high in syns, but they’re also packed with healthy fats, protein, and essential nutrients. If you enjoy them as part of your Slimming World plan, the key is moderation.
Always weigh your portions to avoid going over your syn allowance, and choose plain or unsalted varieties to keep added sugars, oils, and salt to a minimum.
Nuts are nutritious but high in syns due to their fat content. Here's a comprehensive table of every common nut type:
| Nut Type | Portion (25g) | Syns per 25g | Protein per 25g |
|---|---|---|---|
| Almonds | ~23 nuts | 7.5 | 5.3g |
| Brazil Nuts | ~6 nuts | 8 | 3.6g |
| Cashews | ~18 nuts | 7 | 4.5g |
| Chestnuts (roasted) | ~5 nuts | 2.5 | 0.5g |
| Hazelnuts | ~20 nuts | 8 | 3.6g |
| Macadamia Nuts | ~12 nuts | 9 | 2g |
| Peanuts (dry roasted) | ~30 nuts | 7 | 6.3g |
| Peanuts (honey roasted) | ~30 nuts | 7.5 | 5.5g |
| Pecans | ~10 halves | 8.5 | 2.3g |
| Pine Nuts | 2 tbsp | 8.5 | 3.4g |
| Pistachios (shelled) | ~49 nuts | 7 | 5.2g |
| Walnuts | ~7 halves | 8 | 3.7g |
| Mixed Nuts | small handful | 7.5 | 4.5g |
If you're going to spend syns on nuts, choose the ones with the best protein return. Peanuts offer the most protein per syn — 6.3g protein for 7 syns (0.9g per syn). Almonds and pistachios are close behind with 5.2-5.3g protein for 7-7.5 syns. At the other end, macadamia nuts give you just 2g protein for 9 syns — the worst protein-to-syn ratio. Chestnuts are an outlier: only 2.5 syns for 25g, though they're very low in protein.
| Nut Butter | Serving (15g/1 tbsp) | Syns |
|---|---|---|
| Peanut Butter (smooth, standard) | 15g | 5 |
| Peanut Butter (crunchy, standard) | 15g | 5 |
| Almond Butter | 15g | 5 |
| Cashew Butter | 15g | 5 |
| Pip & Nut Smooth Peanut Butter | 15g | 4.5 |
| Powdered Peanut Butter (PB2/PBfit) | 12g (2 tbsp) | 2 |
Pro tip: Powdered peanut butter (PB2 or PBfit) is just 2 syns for 2 tablespoons — less than half the syns of regular peanut butter. Mix with water for a spreadable paste, or stir into porridge, smoothies, or SW-friendly baking.
Nuts are one of the trickiest foods on Slimming World. They're undeniably healthy — packed with good fats, vitamins, and minerals — but at 7-9 syns per 25g handful, they eat through your allowance fast. The biggest danger is mindless eating: a 100g bag of mixed nuts is 30+ syns, and most people can demolish that while watching TV without thinking.
The solution? Pre-portion. Buy individual 25g bags or measure out portions into small containers at the start of the week. Pistachios in their shells are great for SW because the shelling process slows you down and makes you more mindful. For lower-syn snack alternatives with protein, consider boiled eggs (Free), lean ham slices (Free), or Babybel Light (1.5 syns each).
No nuts are Free on Slimming World. All nuts must be synned due to their high fat and calorie content. Even the lowest-syn option (chestnuts at 2.5 syns per 25g) still needs to be counted.
Chestnuts are by far the lowest at 2.5 syns per 25g. Among more common everyday nuts, cashews and peanuts tie at 7 syns per 25g. Macadamia nuts are the highest at 9 syns per 25g.
Some peanut butters are listed as a Healthy Extra B choice on Slimming World — typically 1 level tablespoon (around 25-28g). Check the SW app for currently eligible brands. This is a great way to enjoy peanut butter syn-free as part of your daily plan.
Powdered peanut butter is excellent on Slimming World. At just 2 syns for 2 tablespoons (mixed with water), it gives you peanut butter flavour for a fraction of the syns. It works brilliantly in porridge, smoothies, on rice cakes, or as a dip for apple slices.
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