It's not Danish food, and you don't eat Danish pastries. Much ickier! I think it is called Danish because it was supposedly for the Danish Air Force or something like that. There's a sloo of fad diets that are for some countries' armed forces. I'd bet 95 percent aren't.
Anyway, here's a few days menus - and supposedly you cannot alter a single ingredient. Yeah, I can see I'd lose the weight from wretching it all up!
breakfast 1 cup of coffee + 1 cube sugar
lunch 2 hard boiled eggs + boiled spinach + 1 tomato
diner 200 gr. (7 oz) beef steak + lettuce salad with oil and lemon juice
breakfast 1 cup coffee + 1 cube sugar + 1 slice toasted bread
lunch 2 hard boiled eggs + 1 slice of ham + lettuce salad
dinner boiled celeriac + 1 tomato + 1 fresh fruit
breakfast 1 cup coffee + 1 cube sugar + 1 slice toasted bread
lunch 2 dl. orange juice + 1 serving natural yogurt
dinner 1 hard boiled egg + 1 large grated carrot + 200g cottage cheese
Etc.