@Mutsy - I know what you mean but I think that some people really enjoy the healthy lifestyle so for them it is not so hard to maintain. I think that when you change the food you eat along with the exercise you tend to look forward to your meals and exercise times.
I know that it is a common dieting pitfall when you eat the same food every day. Eventually you get sick of the food and fall off of your eating plan. I think that if you focus on trying new vegetables along with new healthy recipes you would be surprised at how many different healthy meals you can come up with.