Assuming eating "healthy" means eating only fruits, nuts, seeds, and herbs in their raw, natural form, then this is the only appropriate diet of the human species. Conscious fasting - being aware of one's body at all times - is the single most effective method of clearing accumulated waste from the body. Fasting coupled with correct eating is no vice, it is intelligent, intuitive, and a self-aware method of perfecting the human organism.
Those who inform you that you are "extreme" or perhaps even obsessed with health/purity/perfection are those who dwell far below you on the ladder of spiritual evolution; those who, for instance, might eat truly repulsive foods once a week or month (or perhaps even fried or grilled pseudo-foods daily), and then attempt to justify their foolish actions by suggesting that we all need to "let our hair down once in a while" - or a similarly self-destructive statement.
A vice is a weakness, a form of sin, or total lack of self-control - seeking to purify and further one's body, mind and spirit is exactly what we are here to do...and this is no sin!
Pay no heed to the comments of others, Katie, for only you are apt to form opinions on your own diet, your own beliefs, your own goals and desires.