Britney Spears has begun abusing laxatives in an effort to shed her 160 pound frame.

According to a report in Star Magazine, Britney has been downing a “deadly diet cocktail,’ including amphetamines, diuretics, and laxatives, like Swiss Kriss and Super Colon Cleanse, to flush out all the fatty foods she scarfs down everyday.”

“After she fills her stomach with empty calories like potato chips, sodas, cheeseburgers, and candy, a sense of guilt overwhelms her,” a Star insider says. “She wants the food out! She acts like taking laxative is no big deal.”

“She takes large amounts of laxatives to flush out food,” the source continued.

“All she talks about is how she wants to ‘see her ribs stick out’ because the looks sexy. She grabs the fat on her stomach and thighs and says she wishes it would just melt off.”

“She’s lost all her muscle, and because she’s only 5’4, the extra pounds she’s carrying are really showing.”

Laxative abuse can be fatal. “It can cause severe dehydration and loss of essential minerals, particularly potassium. And when your body is depleted of potassium, your heartbeat can become irregular, and you can die. It’s rare, but it does happen,” Washington, DC-based weight-loss specialist Dr. Gabe Mirkin tells Star.