From MB site: just to compare "weight watchers" to "low fat", size is smaller for a ww one but still very similar if you look at the per 100g info (which I didn't include).

Raspberry Apple Weight Watchers Muffin
NUTRITION INFORMATION
Serving size: 109g
Average Quantity per Serving
Energy 932kJ (223Cal)
Protein 2.8g
Fat, Total 1.5g
- Saturated 1.4g
- Polyunsaturated 0.5g
- Monounsaturated 0.5g
Carbohydrate 40.5g
- Sugars 20.1g
Dietary Fibre 1.9g
Sodium 328mg
Ingredients: Low Fat Muffin Mix (Wheat Flour, Sugar, Sweetener Sorbitol (420), Dextrose, Thickeners [1422 (From Maize), 1412 (From Tapioca), 415, 466], Egg Powder, Raising Agents (541,500), Milk Solids, Emulsifiers [477,435,471,340,472(E)], Salt, Vegetable Oil, Oat Fibre, Flavour), Water, Raspberries (8%), Apple (8%)
Contains Wheat, Oats, Egg, Milk.

Raspberry Apple Muffin
NUTRITION INFORMATION
Serving size: 137g
Average Quantity per Serving
Energy 1250kJ (298Cal)
Protein 4.1g
Fat, Total 2.3g
- Saturated 0.7g
Carbohydrate 53.1g
- Sugars 26.7g
Dietary Fibre 3.1g
Sodium 424mg
Ingredients: Low Fat Muffin Mix (Wheat Flour, Sugar, Sweetener Sorbitol (420), Dextrose, Thickeners [1422 (From Maize), 1412 (From Tapioca), 415, 466], Egg Powder, Raising Agents (541,500), Milk Solids, Emulsifiers [477,435,471,340,472(E)], Salt, Vegetable Oil, Oat Fibre, Flavour), Raspberries (18%), Water, Apple (7%)
Contains Wheat, Oats, Egg, Milk.