LOW SUGAR AND FAT

John west Sweet & Sour noodles Steam Pot, 140g, £2.50, sainsburys.co.uk Per 100g: calories, 139; saturated fat, 0.6g; protein, 9.8g; fibre, 0.7g; sugar, 2.6g; salt, 1g CLAIM: ‘Naturally high in protein. Low sugar, low saturated fat.’ EXPERT VERDICT: With 382 calories, little saturated fat and 27g of filling protein from the tuna, this would make a reasonable meal if you added a portion of vegetables on the side. Tuna is a good source of vitamin B12, important for red blood cell manufacture.

However, this has the highest amount of salt of all the products here — 2.8g in a pot, 46 per cent of the daily limit. TASTE: Generous amount of tuna but a bit bland. 4/10