One of the best ways to lose weight is by eating to lose weight. Overall, you are trying to create a calorie deficit meaning that the amount of calories you intake in a day is less than the amount of calories that you burn. While the walking and the light cardio are a good start, she's going to have to come up with a little bit bigger deficit to lose weight. To give you an idea, one pound of fat is 3500 calories. That means that if she created a 500 calorie deficit every single day she would lose 1 pound a week.
One way to help create that deficit aside from working out excessively is by eating to lose weight. Literally, eating more calories will actually cause you to burn more calories. It is like putting gasoline into your car. The car gets the best gas mileage in the first 1/4 of the tank, so if you kept filling your car up when it was 3/4 full you would get the best mileage out of it. Same thing with people, if you keep eating, your body has to keep working to burn it off. This is the theory behind the 4-5 small meals a day that the other posters have mentioned.
Nutritionally speaking, the best way to lose fat is by increasing your protein and your fat intake. Don't cut carbs completely, but if you want your body to start burning fat, then you better start eating a lot of it to show it that this is what it is going to be getting for fuel. Your body stores sugar, which is what carbs are, and when sugar is store it turns into fat- eating fat doesn't make you fat. If you limit your carb intake to fruts and vegetables, you can literally eat as many as you want. Stay away from breads and grains.
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