Experienced individuals can estimate the calorie density of food items like brownies based on similar products.

“so all I do is I just like I don't know what particular brownie that is I don't know how they made or anything like that but it's likely that the calorie density is going to be similar to other brownies right the carb fat ratio might be a little bit different but the calorie density is probably going to be pretty similar so I really just try to think about what do I think this weighs right and so last night I was kind of like it's a little bit denser than a normal brownie I was I put it about 40 grams right and so I put that in”