John Gill Commentary Deuteronomy 8:10

"And thou shalt eat and be full, and thou shalt bless Jehovah thy God for the good land which he hath given thee." — Deuteronomy 8:10 (ASV)

When you have eaten and are full, then you shall bless
the Lord your God
For as the Lord would furnish them with plenty of food, they might eat of it liberally, provided they did not indulge to intemperance, as everyone may whom God has blessed with a fulness of good things; and this shows that we are to return thanks to God for a plentiful meal, as well as to ask a blessing on it:

for the good land which he has given you ;
which supplied them with such plenty, that they enjoyed full meals every day.