Rice Krispies

Rice Krispies by Kellogg's has 389 kcal per 100 g. One serving (30 g) is about 117 kcal.

Rice Krispies contains 7 g of protein per 100 g — about 2.1 g per 30 g serving.

Yes — carbohydrates provide 90% of its calories (86 g per 100 g, of which 7.9 g is sugar). It also delivers 2.9 g of fiber.

Nutri-Score weighs negatives (calories, sugar, saturated fat, sodium) against positives (fiber, protein) per 100 g. Points against come from calorie density (389 kcal), sodium (400 mg). Overall that places it in band B.

About 26 g of Rice Krispies equals 100 kcal. It is energy-dense, so small amounts add up quickly.

Yes — 389 kcal per 100 g makes it calorie-dense; a 50 g portion is already about 194 kcal.

It is a good source: 8 mg per 100 g, about 44% of the daily value. A 200 g portion covers roughly 88%.

Per 100 g it has 7.9 g sugar and 1.2 g fat (0.4 g saturated). Fat provides 3% of its calories, so portion size matters most here.