Lose Weight & Keep it Off with the SlimFast Plan! 5g Fiber‡ ‡Contains 6g Total Fat per Serving. SlimFast Original is a specially formulated meal replacement shake with 10g of protein 5g of fiber and fortified with 24 vitamins and minerals to help control hunger for up to 4 hours. Satiety was measured in a laboratory controlled setting. Each delicious shake is gluten free and perfect for on-the-go or at home. The Slimfast Plan 1. One Sensible Meal enjoy your favorite foods 2. Replace Two Meals a Day with shakes smoothies or bars 3. Indulge in Three Snacks satisfy hunger between meals *When Used as Part of The Slimfast Plan. Individual Results May Vary. Welcome to SlimFast Original a classic for over 40 years bringing you the taste you ll love.