I normally have porridge with honey followed by a slice of my home made bread for breakfast. That comes in at a modest 235 calories ,and is still very satisfying.
This morning I had a very small portion of muesli , verified by my husband that it looked quite small . I had it with natural yogurt and z mandarin orange followed by my brown bread. That breakfast was over double my porridge one in calories. 500!!! I weighed the portion of muesli and that alone was 360 calories for a tiny portion.
Btw there was no added sugar in the muesli. Just oats with fruit and nuts.
Whenever I see people getting bowls of cereal in a hotel their portion s are always much bigger. I doubt people realise how calorie dense muesli is. It was a shock to me.