Whole 30: This is a 30 day lifestyle change where you basically eat only clean, natural foods for 30 days. There are many books related to the diet that help quite a bit. This diet is relatively simple to understand as it is basically clean eating. It is a good month challenge to start the year.
21 day sugar detox: This is a 21 day challenge to remove all forms of sugar or foods that could start sugar cravings. This diet is most useful with the related book that gives you recipes, meals plans, and three different versions of the diet based on your current eating habits. It is more strict and therefore harder than the whole 30 but is also shorter and proves to you that your body really is addicted to sugars. Great diet, but needs meal planning in order to get through it. Make sure and plan the start date accordingly knowing days 4-7 will be rough and you will be cranky. You will feel like a million bucks after that detox period though.
21 day fix: This is a portion control diet. You have to buy the kit that gives you portion control containers that are color coded for which types of food you can put in them. This is a great diet for people that want to slim down but are not fans of food type restriction. A very easy plan to follow and very effective for those that like portion controls.
Low carb: Perfect for those not wanting to spend money on a specific diet plan. Just monitor the number of carbs you eat per day and cut it down to 50 grams per day however you want. Yep, that easy.
Happy new year!