Calorie restricted diet and breaking nails

Alright, I eat about 1500 calories a day - between 20 and 30 percent of those calories are from fat (ALWAYS healthy fats - I eat VERY little saturated fats, usually under 10 grams) It seems when I'm dieting and my calories are low(ish) my nails keep splitting and breaking! - Does anyone else see this? Is there a solution?

Fat aside, make sure you're getting as broad a range of foods as you can.  Iron-deficiency can lead to brittle nails, for example, so you make sure you're getting plenty of iron-rich foods.

Find a vitamin with iron, b12 and biotin. One-A-Days has a vitamin in a green package that has 100% of all of these things. Of course it's better to get your vitamins through foods instead of a pill but sometimes it's hard to find/eat the superfoods your need daily.

On top of what Gi-jane and Soupcan said, I'd like to point out that you're eating the bare minimum for people under 21, and the fact that you exercise quite often makes me think that you may be eating too little...even for weight loss.

i always used to drink a ton of milk all of my life and my nails grew long and strong. i could always tell by my nails how much milk i was drinking, especially when i had to cut back to stay under my target daily calorie intake around age 40 - they began to split and break. i am taking a multi-v and omegaa 369 supplement now and they are long and strong again.