The medical lie regarding salt

Control system theory is a highly mathematical art. Take three output measurements: position, integral and differential (PID) and feed them back in certain proportions to the control in an unstable mechanism and it ends up stable.

This is done in your body by neurons. The control parameter is the regulation of the level of salt. As you jerk it around it compensates.

I don't think you are being too scientific there. If you want to test the level of salt in a liquid you can take advantage of the fact salt conducts electricity. For as little as a fiver you can get a pen-sized digital CF meter. You may also find the kidney is damaged by too much alcohol.

I don't know if salt works in a similar way, but with fat what happens is if you eat too much there is a psychological mechanism which will tell your brain to stop eating as much which kicks in as your weight increases from the target level. The tongue is very sensitive to salt, where too much tastes awful as does too little. There is a good reason your tongue is sensitive to salt, probably something to do with your post, but also bear in mind you sweat salt as well.

There is no proof as far as I can see that salt causes it. Salt does seem to aggravate an existing condition.

Why not just eat what you most feel like eating? Try an experiment if you like. Cut a component of your diet out for a few days, like say normally you say eat fruit or you eat vegetables, then starve your body of the thing you need and you will find very quickly you will get a craving for it, and when you eat what you are short of then you will find it far tastier. Hopefully that will prove this mechanism exists if I can't convince you any other way. It's a natural feedback system and for things which the body needs a precise amount, the effect is so much more pronounced. If this does not work and you insist on ignoring your body then a last resort is it will throw up. 

So bearing this in mind, you then have to think what is going wrong. The answer is so simple and hardly rocket science. People eat together and eat the same meal. What one person needs at that time might be quite different from the other person you serve to. Similarly if you go to a friend and they serve you a meal you can't really dictate to someone who offers something what they should offer you, and when you are in a restaurant or a work's canteen, it is often the case you are restricted. Now we can talk about how much you eat as well. When it is prepared for you, you often can't say, so again you have a mismatch, and thirdly you often don't get to decide when you eat either. The best way to stay healthy is therefore to be a total anarchist, do what you want, when you like, regarding food. I will add one more condition here, and that is that commercial food has various chemicals in it which are not required by the body and only serve to fool you into thinking you are eating something you are not. This fooling of the brain is messing this self regulation up. Now of course not all additives are fooling the body even though they improve taste, like the body understands natural chemicals like sugar and salt. I often look at the ingredients and for example last night two of the additives were citric acid (comes from lemons so totally natural) and carotene, a vegetable extract from any plant that is not green, e.g. carrots, and extremely common in nature. The body understands these chemicals and can regulate them too. The ones which are more critical for balance are indeed sugar and salt, but our bodies already pay particular attention to these. It's all automatic!