A simple way to stay on task when it comes to weight loss is to have someone promise to do these things with you. Having a friend that is also eating healthier and exercising along with you can motivate you to keep going, even if its under the obligation of your promise. Also, this way, not everyone around you is eating the fatty foods you can barely resist.
If someone who likes to cook is looking for something they can do for themselves to lose weight they may be in luck. By preparing homemade meals as opposed to eating out a person can closly monitor what is going into the foods they are eating. Meals can be tailored to individual dietary needs to aid weight loss.