that's why I want vitamins. I eat probably once a day and I've never touched a veggie in my life.
Multi-vitamins are "ok". They're a poor substitute for getting them through food, but work as a supplement to "patch" minor holes in your daily diet. Vitamins have a fairly low absorption rate compared to what you would get from food; so most of it is a waste. Be careful with the one meal a day thing. It will end up wreaking havoc on your metabolism. Even small meals several times a day would be better.
I take a slew of vitamins, Flaxseed and Fish oil for eyes, skin, hair and nail health. I do take a single women's multi-vitamin because it was onsale at the VA Patriot Store and my blood work demonstrated that I was low on Iron. The low iron and some blood protein marker had them wigging out at the VA. They thought I was about to die from blood loss, internal or externally. Actually had a Doctor call me on a Sunday evening, ready to send an ambulance to get me. Turns out, I am either already dead or just have oddball body chemistry.
Obviously, it is that latter, so the extra iron works out for me. Unfortunately, nothing is saving my hair from falling out, pooh! 
Ouch! I had an issue with low iron. I incorporate more red meats into my daily diet. Med-rare burgers, roasts, and blue rare steak. It's kept me off their radar for a while. Low Iron can cause hair loss, interestingly enough.
I ran into a problem with "extreme" shedding, and hair loss. I learned a couple things from the doctors. Even with low testosterone, you can have higher levels of DHT in the scalp. Simply reducing testosterone will not necessarily reduce the levels of DHT your body will produce. Finasteride or Dutraside will help there. Also micronized progesterone will help as a 5a Reductase inhibitor (Medroxyprogesterone is often pushed at the VA, but you can get actual Prometrium). All 3 are available through the VA, though Dutraside is a little more difficult being an "off label" use but still can be done. They also offer Minoxidil in topical, foam, and oral on the Formulary. Your GP, OB, or Endocrinologist should be able to either prescribe or refer you to a Dermatologist at the VA. If none of that seems to work, you can also get human hair wigs through the VA. They will fit you.