Oh man, I was afraid you were going to say that! That's why I wrote that - my intuition was working over time LOL!
No worries, horizontal ridges as if the nail is stepped is malnutrition. Seriously consider getting a juicer if you don't already have one. you need nutrients from real food that's easy to assimilate. Some kind of super-green supplement like E3live or Perfect Food would be wise too. And plenty of Kichadi with tons of veggies. :)