Nutritionists advise us to have a balanced diet, to avoid too much of one thing. A handy rule of thumb is to eat 5 fruits a day, 5 types of pudding and 5 brown foods a day. Stick to a packet of winegums, a whole battenburg cake and 5 or more of the following brown foods every day and you'll be fine:
Potatoes in all their various forms, including Smash
Cake (Don't worry, a brown pudding does not count twice)
Meat - all forms
Note: brown vegetables (parsnips, turnips, swede) are technically not part of the brown foods group, they are officially classified as sort of yellowish.