Hello free time!

 A gluten-free diet is a diet that strictly excludes gluten, which  is a mixture of proteins found in wheat, as well as barley, rye, and  oats.

 "Paleo" refers to the Paleolithic era or the times of the caveman.  The Paleo food movement uses the constructs from this lifestyle and translates it to modern day.  It is a nutrient dense, whole foods diet based on eating high quality meat, seafood, eggs, vegetables, fruits, nuts and seeds while avoiding processed and refined foods and empty calories. 

 The ketogenic diet is a very low-carb, high-fat diet that shares many similarities with the Atkins and low-carb  diets. It involves drastically reducing carbohydrate intake and  replacing it with fat. This reduction in carbs puts your body into a  metabolic state called ketosis. 

AIP (Autoimmune Protocol Elimination Diet) is very effective at addressing autoimmune disease (and related conditions like allergies and non-autoimmune skin conditions) and for identifying food sensitivities.  It is an elimination diet that restricts all of the food most common food allergens/sensitivities as well as foods containing substances known to trigger the immune system (like nightshades).  If you combine this approach with food sensitivity testing it is even more powerful in addressing a huge variety of health conditions.