It's common to hear that garlic should be eaten in the morning and should not be eaten in the evening.
Many people even use the following saying for garlic:
Medicine in the morning, poison in the evening.
It's the old saying in the Czech republic. People refer to it as the wisdom of the ancestors. But nobody is able to say the reason.The exact translation is in my question. You can try google with "cesnek jed vecer" = "garlic poison evening". You will find many links with it, but no explanation.
Is this saying true? What are the rational reasons for not eating garlic in the evening? Or is this saying only a myth?