A 30g bowl of Sainsbury's Honey Nut Cornflakes contains 120 kcal, 8.8g of sugar (all of it free sugar), 0.6g of fibre and 2.0g of protein. With 125ml of semi-skimmed milk the bowl comes to 178 kcal and 14.6g of total sugar. It is classed as NOVA 4 (ultra-processed).
All 29.2g of sugar per 100g in Honey Nut Cornflakes counts as free sugar, because it comes from added sugars rather than whole fruit or milk. A 30g bowl gives 8.8g, about 2.2 teaspoons.
Honey Nut Cornflakes is classed as NOVA 4, ultra-processed, because its ingredients include dextrose. These are industrial ingredients you would not use in a home kitchen. 1 of its 9 ingredients is of this kind.
Boone classifies processing from the published ingredient list using the NOVA system. Added vitamins and minerals are not counted as a marker of ultra-processing.