Now the Spirit expressly says that in later times some will depart from the faith by devoting themselves to deceitful spirits and teachings of demons, through the insincerity of liars whose consciences are seared, who forbid marriage and require abstinence from foods that God created to be received with thanksgiving by those who believe and know the truth. For everything created by God is good, and nothing is to be rejected if it is received with thanksgiving, for it is made holy by the word of God and prayer. (1Ti 4:1-5)Pardon me while I wax philosophical...
There are basically two ways of thinking about the world. They both include good and evil. One view says that Good and Evil are both eternally at war with one another. Usually this view works itself out through ideas that relate Good to the spiritual realm and Evil to the physical realm.
The Biblical view of the world, however, says that God created everything. And when He created everything it was all good. Evil comes to be because of disobedience to the Creator by the created beings. Evil and our sinful natures do not change the substance of what God has created. Trees are still trees even after the fall. Humans are still human. In that much we are said to be good, because God said that His creation was good.
When we receive what God has made with thanksgiving, then we are receiving it properly. Contrast thanksgiving with Eve's sin in the garden. Thanksgiving implies contentment. Eve was not contented with all of the fruit of the other trees, but there arose in here a desire for the fruit of the tree that God had prohibited her from eating. The same with Adam. So there is a fundamental difference between self-indulgent lusts taking what does not belong to us and thankfully receiving what God has given to us.
The relationship between this verse and 'Total Depravity' is a contrast. Since we are 'new creations' we have been given the ability to receive what God has created in the way it was intended to be received and to serve it's original purpose, which is to glorify God.