cutting sugar intake

The numbers of people who are fat is increasing in many developed countries( and developing countries) today.
In the United states, almost half of people are overweight. In Japan, there still are fat people.
Even people know they are overweight, it's hard for them to change their diet(
or their lifestyles) quickly.
I'm also trying to lose weight, but it's hard for me to exercise regularly, or change my diet.
I love to drink coffee with sugar, love to eat cakes, snacks, and chocolate bars.
However, I found an article from TIME magazine that you can easily cut sugar intake by
stop drinking soda. A soda has about 8 teaspoons of sugar in it.
Maybe I should stop drinking coffee with sugar?