You may not always have time to exercise but you always have control over what you eat.
Even if you are in the circumstance where the only food choices are unhealthy you can always just eat a smaller quantity and stay right on track.
The only way to fail is if someone force feeds you too much of an unhealthy food.
With 2MD you learn to lose weight while eating any types of foods. You aren’t going to go off track just because there are no salads available with fat free dressing. Who really wants to eat that all the time anyhow?