Britney had a hit with “Toxic,” but now a toxic diet is taking a hit on Britney.

She loves her fast food and keeps Starbucks in business, but are her eating habits creating the bizarre Britney we’ve been seeing? Access Hollywood examines Britney’s toxic diet.

“When you take a look at Britney Spears and her behavior, it’s very frightening,” Dr. Timothy Brantley, a PHD who educates patients on the power of food, told Access. “She’s a person who’s completely addicted to sugar. This is like heroin for a junkie. She’s literally on a roller coaster to hell.”

Britney’s irrational behavior — from shaving her head to attacking a car with an umbrella — can partly be attributed to her toxic diet of caffeine drinks and fast food, Brantley told Access.

“Caffeine and sugar in this drink will drive your blood sugars and hormones crazy and it can effect your mood for hours,” Brantley said of a Frappuccino.

Britney’s favorite Venti Frapaccino coffee can cause her to become irritable, agitated and lose focus.

“And of course irrational behavior follows that,” Brantley said. “Once you get a quick rise and a quick drop, the body is back in a craving cycle again.”

Additionally, the caffeine content in her extra large soda could cause memory loss, inattentiveness and anxiety.

“If you flood your body with sugars and all of a sudden you become really hyper, I think your judgement is going to be really altered,” he said.

The greasy tacos and fries Britney craves from the drive-thru are equally destructive.

“It’s toxic to the liver,” he said. “It’s going to mess up your hormones.”

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