Yes, without exercising, you can't lose weight. You need exercising and eat right foods and drink plenty of liquid (water or herbal teas) then it will helps to lose weight.
I visited health conference voluntarily at 5 weeks spa resort last year. It's for obese people how to take care of their health etc. They said that it's too stress for the people to count out how many calories they eat a day. Easy to count out fat a day than calories... Interesting...
If you want to lose weight then count up to 60 gram fat a day. I prefer to count up to 60 gram fat a day because it's easy than count out how many calories I eat a day.