According to the expert, in the presence of diseases of the gastrointestinal tract, special attention should be paid to products that can cause discomfort when consumed on an empty stomach. These include citrus fruits and their juice. They stimulate the production of hydrochloric acid and can cause heartburn, stomach pain, and belching.
Kruglova also does not recommend drinking strong coffee and sweet soda on an empty stomach. Fresh baked goods can also cause problems. They can cause heartburn, heaviness, and bloating in some people.
Source: https://rsport.ria.ru/20230226/eda-1854399814.html
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