Buckwheat is rightly considered one of the most nutritious and healthy cereals in the world.
However, combining buckwheat with certain foods can be harmful.
Firstly, you should not eat buckwheat with milk and other dairy products.
The phytic acid contained in buckwheat can bind with calcium and impair its absorption.
Secondly, buckwheat does not go well with eggs. They are known to be rich in protein, the absorption of which is impaired by the soluble fibers contained in buckwheat. It may cause heaviness in the stomach.
Thirdly, you can't drink black tea with buckwheat. The tannins it contains prevent the absorption of iron from buckwheat.