If it's 33% of your meals then 33% of your kcal isn't an unreasonable place to start ;) I'd be surprised to hear that this is common, though. I was actually go

If it's 33% of your meals then 33% of your kcal isn't an unreasonable place to start ;) I'd be surprised to hear that this is common, though. I was actually going to suggest that for this supposed most important meal of the day, the options for breakfast are not very substantial. I have a bowl of cereal (2 x weetabix + semi-skimmed milk) - all of 150kcal. Add a cup of tea and it still won't be past 175kcal. Suppose I have to get up early for whatever reason and treat myself to an extra weetabix to make up for it - 250kcal. This seems to be enough for me (suggesting that perhaps breakfast's importance is indeed overblown - not that I'd like to go without it), but it's not very much. I ate a slice of quiche for lunch today that was more than that.