Bakery
A yeast bun, no matter how tasty and fluffy it may seem, is not a very good option for the first meal. The fact is that yeast can irritate the walls of the stomach - which means that you will suffer from gas formation and bloating all day long.

Coffee
This drink, of course, perfectly invigorates, but also causes hydrochloric acid, which makes up gastric juice, to be produced more intensively. Alas, with such a breakfast it is easy to get indigestion, heartburn, irritable bowel syndrome and even an ulcer.

Kefir and yogurt
No matter how useful breakfast with yogurt may seem to you, hydrochloric acid in an empty stomach will negate all its benefits. The fact is that lactic acid bacteria, for which kefir, curdled milk, fermented baked milk and yoghurts are valued, are simply destroyed by hydrochloric acid.

alcohol
Even if you are on vacation, it is better not to start your morning in a beautiful hotel with a glass of sparkling wine. Once in an empty stomach, alcohol quickly enters the bloodstream, glucose drops, and the body is stressed.

Citrus
In the American series, families often start the day with a glass of orange juice. Citrus fruits are indeed very useful due to vitamin C, but fruit acids on an empty stomach can provoke heartburn and even lead to stomach ulcers. By the way, even apples on an empty stomach are better not to eat - for the same reasons.