Why is it so tough for women to lose weight and what can they do about it?

Nearly 60% of the calories we burn every day comes from doing absolutely nothing at all. This is called your resting metabolic rate, and it is influenced by genetics, body composition (fat vs. muscle), hormones, and organ size. Another 30% is burned during physical activity, and the remaining 10% is consumed due to the thermic effect of food metabolism. So, what does all this mean, and how can I lose weight?

What does this mean?