YOU SAID:
brendan went to the store to buy food
INTO JAPANESE
ブレンダンは食べ物を買うために店に行きました
BACK INTO ENGLISH
Brendan went to the store to buy food.
INTO JAPANESE
ブレンダンは食べ物を買いに店へ行きました。
BACK INTO ENGLISH
Brendan went to the store to buy some food.
INTO JAPANESE
ブレンダンは食べ物を買うために店に行きました。
BACK INTO ENGLISH
Brendan went to the store to buy food.
INTO JAPANESE
ブレンダンは食べ物を買いに店へ行きました。
BACK INTO ENGLISH
Brendan went to the store to buy some food.
INTO JAPANESE
ブレンダンは食べ物を買うために店に行きました。
it is unlikely that this phrase will ever reach equilibrium