Foods for maximum weight loss and weight gain are listed here:

Maximum Weight Loss Foods: 
Almonds, Walnuts 
Beans, Sprouts 
Green Vegetables 
Lean Beef, Buffalo, Chicken, Turkey 
Nut Butters (Almond Butter, Cashew Butter, etc.) 
Olive Oil, Coconut Oil, Flax Seed Oil, Fish Oil 
Jasmine, Basmati, Brown Rice, Whole Grains 
Vegetable Juices 
Colored Fruits, Berries And Vegetables 
Whey Protein Powder 
Wild Caught Salmon 
Raw Or Lightly Pasteurized Organic Whole Milk, Cheese, Kefir, Yogurt 

Fat Loss Factor’s 15 Foods For Guaranteed Weight Gain 
Doughnuts, Pastries 
French Fries, Potato Chips 
Store-Bought Juice, Fruit Drinks 
Decaffeinated Coffee 
Fried Fish, Fried Seafood 
Raw Clams, Oysters Lunch Meat, Smoked Meat, Hot Dogs, Bacon, Sausage 
Soda Diet Pop, Diet Drinks 
Ice Cream 
White Bread, Pasta 
Sugary Breakfast Cereals, Candy 
Vegetable Oil, Shortening, Margarine