Then I started wondering how low calorie they could be . I found a recipe for 40 calories , so of course ... I had to try it . Unfortunately ( or rather fortunately , I suppose ) , my brother has basically NO ingredients for ANYthing . So I had to substitute nearly everything in the recipe because there were no eggs / vegetable oil / applesauce , butter / margarine , salt , or baking soda / self - rising flour .

Generate a question about the above context.
Why is the speaker interested in find low calorie recipes ?
Pick from:
-They are doing a science project to determine if calories and taste are entirely related.
-They are on the marketing board of a food manufacturer and are trying to create low calorie treats.
-They are trying to determine the exact amount of calories in every ingredient for research.
-They are interested in losing weight and are trying to go about it in a systematic fashion.