The Dean Ornish Diet can be tailored to your specific health issues. The strictest version is challenging because it severely reduces fat intake.
Slim-Fast is a reasonable approach to dieting with convenient, grab-and-go shakes and bars. It's fairly easy to follow, but it's not very heart-healthy.
The Zone Diet plan isn't easy to follow or very helpful with weight loss. It requires structuring every meal around specific macronutrient thresholds.