Habits take many months or years to develop, so don't expect to change them overnight. If possible, join a support group, or tell someone about your goal and ask them to periodically check on your progress toward reaching it. If it's worth doing, it's worth doing now. Others seem to differ over whether food restriction or increased activity is more important in weight loss or maintenance. The variables in these studies are enormous.
Nutrition is both a science and an art.
People want an easy solution, but there is no perfect answer. Too many variables, especially genetics, play into the effects of food consumption on a person. Most food product labels now list the percentage of fat, but choosing the right foods doesn't mean limiting yourself to those with less than 30 percent of their calories from fat. That figure should be an average of what you eat during the day, week or year. A slice of pizza can be part of a good diet plan if you balance it with a low-fat food.