13th February 2026

Because the Atkins Eating regimen began within the 1960s, low-carb, high-fat diets (LCHF) have been widespread with. As we speak, the ketogenic weight loss program, one other LCHF weight loss program, continues trending on TikTok. These promise quicker, simpler weight reduction inside the necessity to depend energy. However, like all weight loss program, a low-carb, high-fat weight loss program plan comes with its personal concerns and potential dangers.

Earlier than you leap into an LCHF weight loss program, you need to perceive what it entails and the way it would possibly have an effect on your physique, each now and sooner or later. This weight loss program, because the identify suggests, dramatically cuts carbohydrates—a fairly vital macronutrient—whereas rising fats.

That can assist you make an knowledgeable resolution, listed below are three essential issues to know earlier than beginning an LCHF weight loss program, in accordance with MyFitnessPal registered dietitian Katherine Basbaum.

1. There’s No Strict Definition of a Low-Carb, Excessive-Fats Eating regimen

There isn’t any single agreed-upon protocol or guidelines for a low-carb, high-fat weight loss program. The time period is thrown round lots, however this fashion of consuming takes many various varieties. Most analysis considers a day by day consumption of 20 to 50 grams day by day “low carb.” 

“A low-carb weight loss program is an umbrella time period used when referring to a number of totally different diets,” explains Basbaum. You might also know this weight loss program by names just like the keto weight loss program or the carnivore weight loss program.

Basbaum breaks it down into classes:

  • Very low-carbohydrate weight loss program: “That is sometimes  one which has lower than 10% carbohydrates or 20 to 50 grams of carbs per day,” she says. 
  • Low-carbohydrate weight loss program:That is the much less excessive model of the low-carb weight loss program. It permits for as much as 26% of your day by day energy to return from carbohydrate sources. “Often lower than 130 grams per day,” says Basbaum.
  • Reasonable-carbohydrate. On a reasonable carbohydrate weight loss program, you get 26%-44% of your day by day energy from carbohydrate sources.

In the event you’re going to chop again on carbohydrates, Basbaum suggests contemplating the reasonable carbohydrate route and avoiding very-low carbohydrate diets. 

The vary of carbs on totally different plans permits for some flexibility in the way you implement the weight loss program. Understanding this variability is vital to tailoring the weight loss program to your private wants and way of life, should you select to pursue it.

2. LCHF Diets Result in Weight Loss—At Least within the Quick Time period

One of many major causes persons are drawn to LCHF diets is their potential for fast weight reduction. 

“Low-carb diets are interesting as a result of early weight reduction and relative ease of following the weight loss program for the primary few weeks or months,” says Basbaum. This preliminary success may be motivating and supply a way of feat.

However it’s vital to notice that the long-term well being outcomes of LCHF diets should not well-studied. There’s a lack of in depth analysis on their results over lengthy stretches of years and many years. 

Moreover, the restrictive nature of those diets could make them laborious to stay to over time, in accordance with Basbaum. It may well result in yo-yo weight-reduction plan and weight regain should you return to your standard manner of consuming. 

“Even within the short-term, a low-carb weight loss program will not be applicable and protected for everybody. You will need to focus on the professionals and cons along with your healthcare practitioner earlier than beginning a weight loss program like this,” she notes. Earlier than beginning a low-carb weight loss program or every other new manner of consuming, make an appointment to go over it along with your physician or a dietitian.

Is a Low-Fat or Low-Carb Diet Better For Weight Loss? | MyFitnessPal

3. There Are Quick- and Lengthy-Time period Well being Dangers Related to LCHF Diets

Whereas LCHF diets would possibly assist with fast weight reduction, they don’t seem to be with out potential well being dangers. Within the quick time period, diets just like the ketogenic weight loss program may cause the nausea and mind fog often called “keto flu.”  

The long-term points may be extra severe. “Many low-carb diets, particularly the very low carbohydrate diets such because the ketogenic weight loss program, promote the consumption of enormous quantities of saturated fat (purple meat, bacon, butter, cheese, and so forth.) that will enhance your danger of coronary heart illness,” warns Basbaum.  

When you have sure well being points, this will not be a weight loss program for you. “I’d solely advocate this weight loss program to somebody with no historical past of coronary heart, kidney, or liver illness or diabetes,” says Basbaum. Even should you don’t have any points, as a result of restricted analysis obtainable on long-term adherence, Basbaum suggests following a LCHF weight loss program for no quite a lot of weeks or months, ideally below the supervision of a physician or dietitian. It might be helpful for some as a  leap begin, however “Then I like to recommend transitioning to a extra balanced and sustainable consuming plan,” she says. 

The low fiber content material of those diets is one other concern. A scarcity of fiber can negatively affect intestine well being. Fiber helps your physique preserve a wholesome digestive system and helps the intestine microbiome, a neighborhood of microorganisms, together with micro organism, fungi, and viruses, that dwell in your intestine and will affect your well being.

“Once more, speaking to your physician or dietitian may also help as a result of they will customise a weight loss program like this so that you can make it as protected and efficient as attainable,” says Basbaum.

In the event you do resolve to attempt a LCHF weight loss program, preserve these suggestions in thoughts: 

  • Goal for 25 to 30 grams of fiber per day. 
  • The American Coronary heart Affiliation recommends getting not more than 5% to six% of your day by day energy from saturated fats–should you’re consuming 2,000 energy a day, that’s a restrict of about 13 grams of saturated fats a day.

If you’re proscribing carbs, it’s a good suggestion to trace your fiber and saturated fats by utilizing a meals monitoring app like MyFitnessPal to verify the weight loss program isn’t getting in the best way of a nutritious diet. 

The Backside Line

Bear in mind, you don’t have to drastically reduce carbs or any meals group to attain a wholesome weight. Basbaum says that a greater different to a low-carb, high-fat weight loss program is to chop again on extremely processed carbohydrates (assume: chips, cookies, ice cream, frozen pizzas, pastries) as a substitute of limiting every kind of carbs. 

Loads of whole-food carbohydrates, like fruits, greens, beans, and minimally processed grains, are good on your well being and may also help you drop some weight. Observe your carbohydrates and different macros within the MyFitnessPal App. 

Initially printed September 3 2020; Up to date August 19, 2024

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