• The enzymes and acid in your stomach trigger this nausea. With nothing else in it, your stomach sends signals to your brain that it is in "starvation mode". Your body automatically starts assimilating nutrients from itself by feeding on its on tissue. As you might imagine, your body eating itself can't be an enjoyable experience hence the physical distress you feel from being extremely hungry. Also, I imagine if you did throw up, it would only materialize as dry heaves with a small amount of saliva.
  • Hunger, even slight hunger is the first sign of starvation. Like thirst is the first symptom of dehydration. Keep that in mind as I move forward. An empty stomach is "ab-normal" humans were hunter gathers and, with the exception of famines, pretty much ate all the time.. like grazers. The "normal" happy condition of our ancestors was to eat and go, eat a little here, a little there and stay on the move collecting food as needed. The stomach is therefor designed to have acids in it all the time. Granted when we put something in there more acids and gall fluids rush in to dissolve the matter, but for the most part our stomaches are always churning away at what is inside. Too much of the digestive fluids can trigger an upset "sick" stomach - that is usually the first step toward ulcers BTW. Ideally we should eat at least 6 small meals spaced evenly through the day. 3 big meals are unhealthy and lead to stretched out stomaches which leads to obesity as we attempt to fill that great gapping space. If we ate six small meals a day being half the size of a "normal" meal out stomach would have something to work on and would eventually shrink to the size of our fist. Make a fist - that is as large as your stomach should be, not much can be contained in that space. Further: Carbohydrates are converted into sugars which are released slowly into the blood stream. Sugars are the body's energy source - the fuel that keeps us running. A little bit of food every few hours will keep the sugar level balanced in your body, always high enough to keep you running. Long distances between meals lead to crashes, most notable and felt by most people is the mid-afternoon crash (around 3-5 in the PM). Sugar crashes can have many symptoms one is nausea. The body is absorbing and flushing out minerals, proteins and all of the other nutritive stuff constantly, ideally we should be putting nutrients into our system constantly to cover for that process. Ironically if we did eat or "graze" feed through the day we would eat more per volume than we do with three big meals, however the body would NOT store fuel (food) in the way of fat because it would read a constant trickle of food as being a time of plenty. Fat production is for the most part the body's first step toward surviving starvation during times of famine.

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