Nuts are one of natures perfect foods, seriously, they are! They have a good balance of fat, protein and carbs. Most nuts are very low carb, in fact. However, there are two common “nuts” that need some clarifications from a LCHF point of view.
Cashews: these can be eaten in moderation as a “sometimes” snack because they are the highest in carbohydrates.
Peanuts: these are not even nuts. They are LEGUMES (think beans!). Legumes are not allowed in a LCHF diet because they are higher in carbohydrates. Sure, less than cashews, but still higher than nuts.
Acceptable LCHF nuts are: Almonds, Brazils, Hazelnuts, Macadamia, Pecans, Pinenuts, and Walnuts.
Why, with such a great variety of nuts, would you even consider eating peanuts? This has been an argument I have had many times. Sure, peanuts are cheaper and peanut butter is a staple in a lot of homes, but almond butter tastes so much nicer! and it is healthier! You can also use Almond flour in place of white or wheat flour. And Macadamia nuts crushed make a great mock “graham cracker” crust.
Anyway, if you want to stick closely to the LCHF WOE, you have to ditch the peanuts/butter. If it is the only sustainable protein/fat you have in the house, eat it until you can get almonds/butter and other nuts. It definitely won’t kill you, it will just keep you out of ketosis.
Note: nuts should be consumed in moderation!