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Syns & Slimming World

How Many Syns in Miso Paste?

By Jenny Updated

Miso paste is one of those storecupboard treasures that punches well above its weight, and for anyone following Slimming World it can become a genuinely useful flavour weapon. Made from fermented soybeans, salt, and koji (a cultured grain, usually rice or barley), miso delivers a deep, savoury umami hit that makes lean proteins, vegetables, and broths taste considerably more interesting without needing the butter, cream, or oil that quickly stack up the syns. A teaspoon contains roughly eight calories and only half a syn, which means it slots neatly into everyday cooking without making a dent in your daily allowance.

The real magic of miso on plan is how it transforms otherwise plain dishes. Whisk a teaspoon into hot vegetable stock and you have an instant low-syn soup base for noodles, tofu, prawns, or wilted greens. Brush a little over salmon or chicken before grilling and you get a glossy, caramelised crust that tastes restaurant-worthy. Stir it through Quark or fat-free Greek yoghurt to make a dressing for cold noodle salads, slaws, or roasted aubergine, and you have a creamy, savoury sauce that costs barely anything in syns.

The one thing to watch is salt. Miso is intensely salty by nature, so you very rarely need more than a teaspoon or two per portion, and you'll usually find you can skip adding extra salt altogether. Choose white (shiro) miso for a mellower, sweeter flavour, or red (aka) miso when you want something punchier and more robust. Stored properly in the fridge, an opened tub lasts months, making it brilliant value for the flavour it provides. For plan-friendly batch cooks, miso is quietly indispensable.

Per serving

Miso Paste — syn values

Portion Syns kcal
1 tsp (5g) 0.5 8
2 tsp (10g) 1 16
1 tbsp (15g) 1.5 24
2 tbsp (30g) 2.5 48
3 tbsp (45g) 4 72
50g portion 4 80
100g (per pack reference) 8 160
Syn values are based on Slimming World 2026 guidance. Always double-check with your group or app.

Numbers at a glance

Quick auto-calculated stats for Miso Paste.

10.0syns / 100g
Syns per 100g
useful for comparing brands
3%
of a 15-syn day
based on standard daily allowance
16kcal / syn
calories per syn
the lower, the more 'value' your syns get
7
portion sizes covered
from snack to full serving
0.5syns
cheapest portionat 1 tsp (5g)
smallest serving

Brand breakdown

Popular supermarket and branded products, with the portion-level syn count.

Brand Product Portion Syns kcal
Yutaka Shiro White Miso Paste 1 tbsp (15g) 1.5 24
Clearspring Organic Brown Rice Miso 1 tbsp (15g) 1.5 26
Hikari Organic White Miso 1 tbsp (15g) 1.5 23
Miso Tasty Classic Smooth Miso Paste 1 tbsp (15g) 1.5 25
Sainsbury's Taste the Difference White Miso Paste 1 tbsp (15g) 1.5 24
Tesco Wicked Kitchen Miso Paste 1 tbsp (15g) 1.5 26
Marigold Organic Brown Rice Miso 1 tbsp (15g) 1.5 27

Lower-syn alternatives

Swaps that keep the feel of the original without the syn hit.

Marmite

Free

Marmite is completely Free on Slimming World and delivers a similar umami, savoury depth. A teaspoon stirred into stock, gravy or stews adds richness for zero Syns versus 0.5 for miso. It lacks the subtle sweetness of miso but works well in British-style cooking.

Soy sauce

Free

Light soy sauce is Free on Slimming World and provides salty, savoury flavour in stir-fries and marinades. It pairs with miso in Japanese dishes or can replace it entirely. Both are fermented soybean products with similar umami character.

Stock cube dissolved in water

Free

A stock cube dissolved in hot water is Free and creates a similar broth base to miso soup. Add vegetables, noodles and protein for a Free meal. It saves the 0.5 Syns per teaspoon of miso, though the flavour profile is more Western.

FAQs

How many syns in miso paste?

Miso paste is 0.5 Syns per teaspoon (5g), 1 Syn for two teaspoons, and 1.5 Syns per tablespoon (15g). A 100g reference portion is 8 Syns. The Syn values are consistent across white, red and brown miso varieties, and all major brands from Yutaka to Clearspring are the same at 1.5 Syns per tablespoon.

Is miso paste free on Slimming World?

No, miso paste is not technically Free, but at 0.5 Syns per teaspoon it is extremely low. A teaspoon is enough to flavour a bowl of soup, a salmon fillet or a dressing, so the Syn cost per actual serving is negligible. It is one of the best-value flavour boosters available on plan.

Can you have miso soup on Slimming World?

Yes, miso soup is a brilliant low-Syn option. A teaspoon of miso paste at 0.5 Syns dissolved in hot water with Free vegetables, tofu, spring onions and noodles makes a satisfying meal for virtually nothing. Many members use it as a starter or light lunch that fills the gap without spending Syns.

What type of miso is best for Slimming World?

All types of miso are the same Syn value at 0.5 Syns per teaspoon. White (shiro) miso is milder and sweeter, good for dressings and lighter dishes. Red (aka) miso is stronger and more robust, better for stews and marinades. Choose based on flavour preference rather than Syn differences.

Lower-syn sauce alternatives

Food Portion Syns vs current
Fish Sauce 1 tsp (5ml) FREE −0.5 syns
Soy Sauce 1 tsp (5ml) FREE −0.5 syns
Stock Cube 1 cube (Knorr / Oxo) FREE −0.5 syns
Tomato Puree 1 tbsp (15g) FREE −0.5 syns
Wine Vinegar 1 tbsp (15ml) FREE −0.5 syns

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