I'm doing fitness sport for more than one year, and decided that I want to track my calories, in order to slowly gain weight. My problem is, that I often cook food for two days. When cooking I'm scanning all ingrediances, but most of the time I dont eat everything, but keep it for the next day. So what is thee best way for dealing with this? Is there a way i can say, I ate just 50% or just 500g of a meal?