Unfortunately, with regards to my gastrointestinal tract, this appears to not be the case.
Occasionally, when I am presented with a vast array of food I feel myself unable to resist attempting to eat every single bit that is there. I can often resist eating anything at all, but once I start eating I just don’t seem to have on off switch. Once I’ve started, I reason, I may as well just keep on going.
And part of the logic, if there is any rational thought going on in my food-addled brain, is that my gastro-intestinal tract must have a limited capacity for work. That even if I ate all the calories in the world, my gastrointestinal tract would achieve its maximum running capacity and then with a combination of clanks and wheezing and groaning noises it would allow a large quantity of undigested calories to exit via the back door.
This theory, I believe, was formulated during lectures on physiology and biochemistry. Enzymes, you see, are the key to this. Enzymes are just like my model for machines. They are little molecular machines that perform a variety of tasks in the body. The enzyme lactase, for example, converts the disaccharide lactose into the monosaccharides glucose and galactose.
So if you were to put some of the enzyme lactase into a jar and chuck in a bit of lactose, the enzyme would get on with the job at a rate that was dependent on the concentration of lactose. If you chucked in some more lactose, then the rate would increase. Add some more and the rate increases further. But this only works up to a point. Once all the enzyme molecules are engaged in working on converting lactose to glucose and galactose, then you can add lactose until you’re blue in the face, but the enzyme molecules can’t work any faster. This limitation has probably got a name which I will now ask Professor Google to advise me upon…
…well, Professor Google is an idiot who babbled on about Michaelis-Menten enzyme kinetics. But he did furnish me with a graph which I’m sure makes it all very clear.
I am such an idiot.
For one, I didn’t consider the possibility that maybe my digestive tract is super-efficient and that its capacity for work may exceed my capacity to eat.
And for two, my gastrointestinal tract doesn’t need to work any harder on the food, it just needs to hold onto it for longer.
Once again, my gastrointestinal tract outwits my brain.
And that is yet another reason why I am fat.