Prabin
diabetic chocolates probably aren't harmful, but as has been written, if it contains polyol sweetener, and you are sensitive to it, you could develop diarrhoea.
A small amount doesn't actually affect me at all.
However it doesn't taste particularly nice and costs a lot.
High cocoa solids dak chocolate is often lower in sugars. LIdl do a 74% one which is 33grams of sugar per 100g. Others are lower. Then Just hav a LITTLE bit. 33% of one square isn't a lot of sugar in total
Hana
PS a TINY bit of almost anything isn't going to destroy weeks of carb counting.