Yeah I had one solid meal a day but I would drink Milk, its why I was thinking of trying this all whey diet of frank mir, but that didn't sit well with me, the Milk diet didn't bother me like this, maybe some chemicals in the protein powder irritated my intestines?
The GOMAD is not healthy though shit will bring up your cholesterol, make you bloated looking and give you greasy skin thats why they say only do it for 3 months its basically for bulking. It works though especially if you aint lactose intolerant. you have to drink WHOLE milk not lowfat. you can add Ovaltine or Chocolate powder too, but you HAVE to work out do mostly stuff like bench press, squats, pull ups, bentover rows, etc.
Vitamin and minerals are necessity
but vitamin pills and supplements are overrated, just get your vitamins from whole foods, most of the shit over the counter just contain filler and most lost its potency they did studies on consumer science that many of the multi vitamins dont even contain 50 percent potency or some dont even contain the key ingredients advertised many had fillers like rice powder, and tapioca powder.