Insanity Nutrition

Hey,

I started Insanity, day 1, and hope to try and keep to it.
However, I live in the sort of household where we eat together and we eat the same thing, so although I can cut out sweets etc. and I can probably have a couple extra snacks to increase my meals, I doubt I will be able to follow the nutritional plan exactly as provided by the program. Did people feel this hindered their success. Also what do u think is the key? Increase the food consumed (obv the right stuff) or would it be okay to go with my:

Morning: Cereal
Lunch: sandwhich/rice
Mid-day: tea, maybe a biscuit or banana
Evening: Homemade curry + low cal ice-lolli

Snacks: tea/ banana