GRAPEVINE, TEXAS—Professional figure athelte Katina Maistrellis is working out for her next competition and will soon restrict her diet to a thousand calories a day for an entire week.
She's aware that health experts say crash dieting can unhealthy or even deadly.
"It's only for a short time so I'm not that concerned about it," Katina said. "I definitely feel lethargic. I tend to get a little bit moody, cranky, dizziness, yea definitely, especially when I'm doing a cardio work out, I mean it's obviously a strain on your body you know it's going to strip off weight, strip off muscle so it definitely takes a toll."
Baylor-Grapevine dietician Ashley Kadlubar is a dietician and said patients often choose weight loss surgery after failed crash diets. Kadlubar said crash diets and cleansing diets are unsafe and can even stress the heart.
"A lot of times they cut their calories, maybe they start exercising more and they start feeling side effects or maybe they go on a product that would cause unwanted side effects such as cardiovascular disease," Kadlubar said.
Shortages of potassium, magnesium and copper can tax the heart and at the very least make crash dieters feel terrible.
"Headaches, nausea, vomiting I mean a lot of these different things you body just isn't made to function on that low of calories," Kadlubar said.
Two years ago Christin Fields wanted to get swimsuit ready in a hurry. She rattled off a short list of items she could consume.
"It's just a mixture of lemon, maple sugar, cayenne pepper and purified water. You drink it and that's all you drink--or water," Kristen said.
Kristen lost seven pounds and looked great, but felt weak and then gained all her weight back which dietician Kadlubar said is not uncommon.
"Here at Baylor-Grapevine a lot of our weight loss surgery patients have tired fad diets and have actually found themselves heavier than when they first started dieting."
Christen said probably won't crash diet again because she's staying fit the old fashioned way.
"I don't think I'll do it again now because I have a personal trainer."
Experts say January and spring are the two times of the year when people are most likely to on a crash diet or liquid diet.