The keto diet. You've probably heard of it by now.

It's the low-carb, high-fat diet that caught on and spread quickly, leading some to label it as a fad, while others praised its effectiveness.

The new year brings in anannual flood of personalhealth goals, and for those trying to lose weight, the keto diet might have come into consideration. Is it effective? More importantly, is ithealthy?

Before making any commitments to keto, it's important to understand what you're getting yourself into.In addition to whatthe health professionals below have to say about keto, it's important to consult your doctor before embarking on any high-fat diets.

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Though there are slightly different versions of the ketogenic diet, it's primarily based on a low intake of carbohydrates coupled with a high intake of fat and protein.

Generally, this means people on the diet get70% to 80% of their daily calories from fat, about 20%from protein and about 5%from carbs.

The decreased intake of carbs forces the body into the state of ketosis,in which fat becomes the main provider of fuel for the body.

Though similar, keto is not the same as the Paleo and Atkins diets, which also feature low-carb routines.

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The diet has been associated with effective weight loss, but it doesn't necessarily get the approval from doctors.

"I wouldn't recommend the keto diet to anybody," Jeffrey Mechanick, medical director at Mount Sinai Heart's Marie-Jose and Henry R. Kravis Center for ClinicalCardiovascular Health,told USA TODAY.

When it comes to dissecting popular diets such as keto, doctors stress the importanceof knowing the difference between weight loss and genuine overall health.

Reducing your intake of carbs, as the keto diet does, goes hand-in-hand with reducing intake of whole grains, fruits and some vegetables, which raises red flags for health professionals.

"That's where Iget a little concerned about the keto diet," Vasanti Malik, adjunct assistant professor of Nutrition at the Harvard T.H. Chan School of Public Health, told USA TODAY.

"You want to be mindful, because these foods whole grains, fruits and vegetables carry a number of beneficial nutrients vitamins, polyphenols, fiber that have been shown time and time again to be beneficial for cardiometabolic health."

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As the keto diet essentially nixes the body's intake of carbs, the bodysearches for an alternative source of fuel. Before long, the body breaksdown fat,muscle and tissues to sustain itself, Mechanick said.

"In theory, the keto diet basically mimics starvation," Mechanick said."If you don't eat carbohydrates but you eat an excessive amount of fat and protein, you're still going to waste tissue. Tissue is still going to burn off."

Yes, you might experience weight loss on the keto diet,but that might not actually be good for you, considering what you giveup.

"I don't feel particularly comfortable telling people to reduce intake of things that we know offer benefits for health," Malik said.

Diet-driven peoplemight find this part hard to digest.

Doctors are moving away from what we traditionally think of as a "diet," one with specific restrictions or calorie goals. Instead, theypromotea healthier overall lifestyle.

"The vernacular is changing," Mechanick said. "We try not to even use the word 'diet.' We try to use the phrase 'eating pattern.'"

There's a "rebound" issue with many fad diets such as keto, Malik said. You go on the diet, lose weight, but what happens after that? Most people struggle to stick with it.

"Without a realistic lifestyle change, the individual is going to regain the weight," she said.

The answer might not be a traditional "diet" at all,but there are changes you can make to shed weight while leading a healthy and sustainable lifestyle.

The importance comes in the quality of the foods you eat, not necessarily the number of calories you consume, Malik said. She favors of eating patterns that don't abide by a restrictive calorie count, because they generally help people stick with the pattern longer.

Mechanick recommends minimizing your intake of two types of carbs sugars and starches while boosting another: fiber. High-fiber foods,including vegetables, low-glycemic index fruits, beans and nuts, are instrumental to a healthy eating pattern, he said.

"If you can get it up to seven to 10 servings a day, that's great," he said."You can't do that with the keto diet."

Malik urges people trying to lose weightto target foodssuch as whole grains, fruits, vegetables andnuts, while limiting saturated fat, added sugar and added sodium. Balance those practices with daily physical exercise, and you've established a solid base for weight loss and a healthy lifestyle.Althoughshe argues against daily calorie counting, Malik urges caution about portion sizes there's no use in overeating. Avoid appetizers andsnacks in front of screens, and limit meals to one plate of food, the American Heart Association advises.

Losing weight has its benefits, both in a physical and mental sense. But when striving to eat well and hit the treadmill, don't lose sight of what it means to be healthy.

"People have to be content,"Mechanick said."They have to be fulfilled. That's what being healthy and productiveis, and that's really the endpoint."

Follow USA TODAY's Jay Cannon on Twitter: @JayTCannon

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