Ananova:

A US woman claims to have lost 33 pounds by eating nothing but McDonald's for 90 days.

Merab Morgan, of Henderson, North Carolina, began her diet because she found the Super Size Me film insulting.

In the documentary, film maker Morgan Spurlock put on 25lbs after eating excusively at McDonald's for just one month.

Ms Morgan, 35, memorised the calories in almost every menu item, and limits herself to 1,400 calories a day, reports the Detroit Free Press.

"It's kind of like the poor man's diet," said Morgan, who has tried Weight Watchers and Atkins but failed because of the time and money those plans required.

Her goal is to lose 40 to 60 pounds. By Day 67, she had lost 33.

Nothing at McDonald's is off limits, although she's only eaten french fries twice - you're better off eating two cheeseburgers, she says.

Nutritionist Barry Popkin says eating only at McDonald's isn't healthy, and he worries Morgan will need more vitamins, minerals, fibre and dairy.

But he admitted: "She's created, for her lifestyle, a very smart diet. The moral of the story for every person is, you've got to work out a plan that fits your lifestyle."