Christopher Ellis shows a baking soda test for stomach acid: drink a teaspoon dissolved in water and time your burp. A burp within two minutes means normal acid; four to six minutes suggests low acid and poor digestion.
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This is a quick little test. It's not the most reliable test in the world, but it gives you some idea. So, the baking soda test is you take a teaspoon of baking soda, you put it in a small glass of water, you stir it, and then you swallow it and time how long it takes to burp. It should take you 2 minutes or less to burp. If it's like 4 or 5, 6 minutes, that's a pretty good indicator that you have low stomach acid and poor digestion because when you mix acid acid with sodium bicarbonate, it creates an eruption. So, it's kind of like that middle school science experiment with the volcano. Same thing. You should— you're supposed to belch after a minute or 2.