I am a 21 year old guy. I am a student. I had pretty good immunity some months back. I didn't get ill easily. Just once in a season or less. But since these past two months, I got fever and body ache (couple of times cold also) three times. I admit that I hadn't been eating a healthy diet in these two months compared to my past. And I can literally feel that my body is now vulnerable with these daily health problems. The point is that whenever my body is going to get fever, I get to know it two days earlier, reason being that I feel soreness in my body. Complete body starts aching. And this phenomena is almost 90% correct. So, is there a way that I can do something, like eating, doing, sleeping properly or something? So that I can keep these things away before hand (two days earlier). I would be grateful to you.