Yeah, these are made up. The Bible is a higher authority than the opinions of saints.

• Eating before the time of meals.
  This is specifically for eating before a meal. But 1 Corinthians 11:34 says that if you're hungry, you should eat at home before a group meal so that you're not hogging food at the meal.
• Seeking better quality foods.
  The example given was the Israelites complaining about the food they were given. That doesn't mean you can't take food you have access to.
• Preparing food better.
  Matthew 5:13 - "But what good is salt if it has lost its flavor?" Jesus clearly saw the value in seasoning.
• Eating more than you need.
  It is true that you should eat in moderation. I don't know if it's a sin, but Proverbs has a few things to say about it. But the example given here was Sodom, whose sins included gluttony. Or rather, gluttony while there were poor people. Overeating at the expense of others is different from just overeating.
• Taking food too eagerly.
  If it's to the point of idolizing food (prioritizing it over God and His causes,) then yes. But if you're at a friend's house and they bring out mac & cheese and you cheer, there's nothing wrong with that. Y'know, as long as you're not being crazy like snatching it out of their hands.