What does it mean to be "satisfied?" "sated?"
How do you know when you have reached that point?
What are the necessary elements of feeling or being satisfied?
Is there a difference between blessing the land and blessing the food?
When a person eats and is satisfied, he is liable to reject God as the verse says: lest you eat and become satiated…and forget the Lord, your God (Deuteronomy 8:12–14). Therefore, God commanded that when one eats and is satiated, he should mention God with thanks and remember that “He is the one who gives you strength for accomplishments” (Deuteronomy 8:18)
R. Meir Simcha Hakohen from Dvinsk, Deuteronomy 8:10
R. Meir Simcha Hakohen from Dvinsk (1843–1926, Rabbi and scholar from Eastern Europe) notes the constant possibility that material comfort can create a sense of complacency and arrogance. It is often easier to turn to God when hungry than after finishing a lavish meal. The Torah addresses this potential pitfall by placing the grace after the meal. In many ways, people have a much greater need for a reminder about God and our religious commitments after eating than before.
Rabbi Yizchak Blau