That is kind of an odd thing to say. I guess from my point of view you are admitting that meat is the base of your diet (not a bad thing) and that you get no other nutrients from other food (kinda is a bad thing). Nuts, soy, tofu, fruits and veggies should really be a huge part of an omnivore's diet (ok- maybe not tofu so much... or soy. just because meat eaters tend to avoid those). Anyways, when you stop eating meat for a little bit and get malnourished, it probably means you are not eating correctly while eating meat. Does this make any sense or am I just offending you?
I bring this up because I hear a lot of people say things along the lines of 'I never eat veggies...' and when they ask me what I eat regularly people seem 'weirded out' that I actually consume a lot of fruits and veggies. Since the tiny top of the food pyramid is meat and that is what many people eat most of, that concerns me. Again, sorry if this doesn't make sense or is offensive.