actually they spend all their money on buying food, and insist on that i use food too...i usually dont, despite their nagging

i usually say: if you need food to clear content, you're doing it wrong. If you're doing it right, you don't need food.
If you don't know what you're doing, you'll wipe even with 25% echo buff....food certainly isn't going to make a difference.
If you know what you're doing, food is still not going to make any difference.
so bottom line, it's totally pointless.
Only food worth mentioning, is DoL/DoH, and possibly acc food.