The main difference between keto and the Atkins diet is that the latter re-introduces higher carb limits after a period of time. So it starts as a keto diet but then transitions into a low (or lower) carb diet that can include up to 100 grams of carbs per day. Atkins leverages the principles of ketosis for weight loss. Once you have reached your goal weight, you can eat higher amounts of carbs (~100 grams per day), as long as you maintain your weight. Of course, at that point you're not in ketosis anymore, and you won't get any of the benefits of a ketogenic diet besides the initial weight loss. In my opinion, that should be seen as a side effect of a healthy lifestyle and should not be the primary goal of your dietary change.Atkins has three protocols you can start with: Atkins 20, Atkins 40, and Atkins 100.The number associated with each protocol represents the grams of carbs you can have per day. Depending on how overweight you are, you get placed into one of those three buckets. With keto, people of all weights consume about the same proportion of dietary fat.