Finally, and something for you to try at home, Sanna recommended the stomach acid test.  This is a simple test to indicate whether you have sufficient amounts of stomach acid which is important for proper digestion and the absorption of essential vitamins and minerals.  You will need: 1 teaspoon of bicarbonate of soda (baking soda) in a small glass of water. On an empty stomach, e.g. first thing in the morning, drink the solution.  Note down any reactions over the next 15-30 minutes.  This can include burping, a bloated feeling in the stomach or no reaction at all.  If you burp then you have sufficient acid however if there is no reaction then your body is missing the acid it needs to function properly so you may need to take some enzymes to heal this.