I had no idea! This is so true for me

Iron Deficiency
Iron is essential for your body to produce hemoglobin, which helps carry oxygen to cells, including those responsible for nail growth and health. Iron deficiency can lead to brittle and oddly shaped nails. Consider incorporating more iron-rich foods like spinach, red meat, lentils, and fortified cereals into your diet.
Insufficient Protein
Keratin, a protein, is a major component of nails. A diet low in protein can lead to weak nail structure and increased breakage. To increase your protein intake, include more lean meats, poultry, fish, legumes, and dairy products in your meals.
2. Hydration Issues
Dehydration can have a significant impact on your nails, making them brittle and more likely to split. Drinking plenty of water throughout the day helps keep nails supple and strong.
3. Environmental Factors
Chemical Exposure
Regular contact with harsh chemicals, including cleaning products, nail polish removers, and detergents, can weaken your nails over time. Wearing gloves while cleaning and choosing non-acetone nail polish removers can help mitigate these effects.