Frozen entrees are a dieter's best friend...and with good reason. They're convenient, low in calories and come in a variety of meals. Even better, these ready-made meals fit with just about any weight-loss plan. When a Lean Cuisine, Healthy Choice or Weight Watchers meal is for lunch, you know the proper portion sizes have already been laid out for you. And where else can you enjoy chicken tenderloins, cornbread stuffing and whipped potatoes for just 5 grams of fat and 240 calories? The problem lies with the fact that most dieters don't look past the fat and calories. Little do they know they're pouring some serious salt into their weight-loss wounds. There is a downside with stocking up on frozen foods. A typical frozen entrée can be loaded with sodium.