If you know anything about the keto diet, you understand that the eating style is preeettyyy restrictive, and not the easiest to stick with long-term. Still, fans of the high-fat, low-carb diet tout benefits like weight loss breakthroughs, more energy, clearer skin, and less cravings for sugar.

Sounds wonderful, right? Well, a new version of keto aimed at upping all of these perks has keto fanatics buzzing, but some health and nutrition pros say it may be even more unsustainable than the keto diet you already know. The new version is called Speed Keto, and dietitians aren't exactly recommending it if you're looking to lose weight or start eating healthier.

Still, if you're curious about the eating plan and its origin, here's what you need to know.

What is the Speed Keto diet?

Basically, Speed Keto is a combination of the traditional keto diet (made up of 60 to 70 percent fat, 15 to 30 percent protein, and 5 to 10 percent carbs) and intermittent fasting (IF), which involves alternating between various periods of fasting and eating. One of the most common styles of IF is the 16:8 method, in which you fast for 16 hours and can eat during the 8-hour period that follows.

When it comes to Speed Keto, the goal is to get the dieter down to one meal per day, which also has to fit into the keto guidelines of being high-fat and low-carb. The goal of eating less carbs is to get the body into a state of ketosis, which is when your body burns fat, instead of carbohydrate stores, for fuel, which can lead to weight loss.