The Lotus.
He also told them to not eat Helios' cattle.
The Laestrygonians spear most of Odysseus' men and take them home to eat.
Odysseus' men were forbidden to slay and or eat the cattle of Helios' island.
Pinefruits
If his crew eat the Lotus, they will lose all desire to return home. Odysseus needs the men to return home himself, and he is responsible for these men.
After 30 days of starving when Odysseus is asleep.
Odysseus men ate the golden cattle of Helios, causing Zeus to be enraged at them.
She asked that Odysseus eat and drink. Odysseus made the demand of freeing his men upon her, not the other way around, before he would eat, drink and be 'friendly' with her again. After freeing the men, she tells Odysseus to bring his ship ashore, hide it, and bring the rest of his men.
That Cyclops will eat Odysseus last of the men.
Not to kill them, which Odysseus warns his men not do to - and which they do anyway to their doom.
They disobey Odysseus and eat the cattle while Odysseus is taking a nap.
He promised, as a "gift," to eat Odysseus last- after he ate all of his men.
Odysseus claimed that he and his men had been shipwrecked. He said this to hide the location of his ship from Polyphemus.