Start your adventure and go to the sewer dungeon and reach the 20th floor, defeat and remove the nail from the root, in that dungeon I found the pile driver, it is for me the best weapon in the game, then leave the dungeon and leave to the anvil and improve the pile driver up to level 10, you can sacrifice other armor, Scrap and repeated weapons if you wish, also improve the sword that they give you at the beginning so that it gives you more xp in each combat, I used those two weapons throughout throughout my adventure and it was great for me. I never used fat, only to improve my physical appearance, I advise you to only gain size or muscle and upgrade any essence you see, food has no more mystery, you consume it and it regenerates you, some more than others, other foods give temporary buffs, I only eat hamburgers and fries, if you're full you simply can't eat more haha, it doesn't affect combat, it just limits you to not being able to eat more in combat