>>6007>If you really are as that commented suggested "sitting on your ass all day" and are still skinny, there is definitely something wrong with your body and your diet.
Alright let's take this from the top. Each action the body takes, whether that action is voluntary movement or bodily function, requires an amount of energy. This energy is taken from food or drink, and in the absence of food or drink, it is taken from stored energy in the body. Excess sustenance will result in the storing of this energy as tissue. If one consumes the necessary energy required to match the rate at which it is used, then the system is balanced and the body weight will stay the same, since no energy will need to be taken or stored as tissue. If you literally sit and have no voluntary movement, the amount of energy required to maintain body weight will be related to your metabolic rate. Therefore, it is very possible to maintain a low weight with simple measurement of calorie intake and a knowledge of your own metabolic rate. You do, however, still need vitamins, which I'll explain later.
>There needs to be food in your stomach or you piss [vitamins] out.
That isn't true all of the time. Vitamins are absorbed into the bloodstream when they are dissolved in the stomach and digested. The bioavailability of certain vitamins is very high on an empty stomach. Some vitamins which have poor bioavailability on their own can be taken with a surprisingly small amount of food with to achieve sufficient absorption. It is unlikely that you would need to take multiple vitamins which require a large amount of food in the stomach to be digested properly.
Besides the jargon, I'll give you a real-world example of people who eat nutritiously, yet who rarely are active and spend most of their time sitting/laying down, and don't gain weight- people who are hooked up to parenteral nutrition, and also people who are fed through a tube. These people receive the exact amount of vitamins and nutrients required to maintain their bodies. Their diet is, objectively, very healthy. Also, back when Soylent (the food substitute) required you to mix all the ingredients together yourself, you could create a food which was low in calories yet had all of your daily vitamin and mineral content required. Tell me again how sitting in front of a computer all day results in getting fat (and unhealthy)?
Just like >>6011
said, >I keep track of what's in everything I eat and I get more than I need of everything, it's easy enough.
this isn't difficult to understand.