by SHAPE Diet Doctor Mike Roussell, phDHomemade smoothies are a fast and easy way to fit high-quality nutrition into your day. "Homemade" is key, as most commercial/premade smoothies are packed with simple sugars and enough calories to fuel your entire workday, putting you on the fast track to developing diabetes.Here's a foolproof plan (plus a couple of my favorite recipes) for mixing the perfect meal or snack every time. Simply fill your blender with a little from each of the following categories, and you're guaranteed to get a nutritionist-approved final product.1. ...