OK - Wheatabix is OK although it does have some sugar. Wholegrain Wheat (105%)*, Malted Barley Extract, Sugar, Salt, Niacin, Iron, Thiamin (B1), Riboflavin (B2), Folic Acid.
Alpen is Wholegrain Wheat (42%), Wholegrain Rolled Oats (36%), Raisins (15%), Dried Skimmed Milk, Dried Milk Whey, Roasted Sliced Nuts (3%) (Hazelnuts & Almonds), Malted Barley Extract, Salt. This is not OK because of the raisins. Dried fruits are concentrated sugar and are not allowed on SOuth Beach. Is this what you meant by meusli? I don't think it would throw you much to eat it. especially with extra oats in it. A lot of meusli cereals are just loaded with dried fruit and nuts and sometimems even honey.
Wheatabix has 4.4 grams of sugar and Alpen has 15.9 even in the no sugar one. Better choose Wheatabix
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