does the color of food dtermine if we want to eat it or not?

Answer 1

definitely yes....
In some cases the aroma of food plays a main role...

Answer 2

To a certain degree, yes. Our minds are very suggestive, and the way you perceive something can be affected by your expectations. Certain foods look unappealing, so you may "decide" you dislike them without actually considering the taste. Furthermore, there are only four or five different taste receptors, but yet there are many, many different tasting foods. How can this be? Different combinations of receptors are stimulated for one, but the other factor is the texture of the food. Have you ever eaten something that feels gross (think tripe or calamari)? That affects whether or not you like it, even if it tastes good.

Answer 3

Definitely.
A green piece of meat is likely to be spoiled.
Bright blue mashed potatoes are apt to be a turn off.
We are conditioned to have certain expectations about the appearance of food, and if those expectations are not met, we may find the food less appetizing.

Of course, all those presupposes that we possess sight. For the blind, smell, taste, and feel are critical.

Answer 4

Yes. In fact one dieter trick is to mix blue food coloring in your food because it makes it unappetizing visually.

Colors also stimulate our hunger. It's no coincidence that McDonald's colors are red and yellow.