Obesity may be on the rise in the United States because fast foods or food with high amounts of fat and calories tends to be cheaper then so called healthy foods such as salads and vegetables. As that’s the case people have the idea to chose the cheaper option. Another reason is because most people’s tastebuds have more of a liking to “fatty foods” then healthier options.
She could consume calories that are greater than 1500 because the baby within her womb will be taking in some calories for him/herself and leave the mother with less food being digested for herself.