Study Diets
We will give you all your food and drink (except water, coffee and tea) during the feeding periods. The order of the feeding periods will be random.
- In one feeding period you will eat a high glycemic carb diet — high in food made with white flour and other refined carbs.
- In the other feeding period, you will eat a low glycemic carb diet — low in sugar and high in complex carbs such as whole grains, fruit and vegetables.
During the feeding period, you must eat only what we give you. You cannot eat or drink any of your own food except water, coffee or tea. If you need sweetener or milk for your coffee or tea, we will give it to you. What you can add to your coffee or tea is limited by the study rules. You may drink as much water as you want.
Each feeding period lasts 4 weeks (28 days). Between feeding periods you will go back to eating your own food. This break will last at least 4 weeks. It could be longer, depending on your schedule.
4 weeks (first feeding period)
+ 4 weeks or more (your own food)
+ 4 weeks (second feeding period)
=12 weeks or more on the study
The food you will eat is real food, just like you buy in the grocery store. The high glycemic carb diet and the low glycemic carb diet differ in the amount and types of carbs. The high glycemic carb diet is high in sugar and starchy vegetables. It includes white bread, white rice and pasta, cooked fruits and vegetables, cake and cookies. The low glycemic carb diet is low in sugar. It includes whole grains such as barley, beans and lentils, limited choices of fruit and vegetable and whole grain bread.
We do not want you to gain or lose weight. The amount of calories you eat on the study will be similar to what you eat now. You will need to eat all the food we give you each day. However, if you are extra hungry or feel that you can't finish all the foods, please tell the study staff and we will adjust the portions we give you. If you are unable to eat the study diets as assigned and after we make changes, we will ask you to withdraw from the study.
Study Menus
The CARB Study menu will repeat every seven days, so you will eat each item at least four times during each feeding period (and some even more). Please look over the menus carefully before you start the study. You cannot strongly dislike any of the listed foods, as you must be prepared to eat all the offered menu items. You must not be allergic or intolerant to any food listed except milk. Low-lactose milk (Lactaid-100) can be substituted for regular milk. This menu is designed for research purposes; therefore we cannot make any other substitutions.
Some calorie-free/low-cal foods can be added to either diet in limited amounts. These include things like sugar substitutes, diet soda and Crystal Light ™, sugar-free gum and hot sauce and spices.
The days that you will eat the study diets will be assigned but we will do our best to fit your schedule.
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