What does the nail colour indicate in health wise?

There was this saying that i used to know where you look at your nails and you can tell what nutrient you are lacking? Or something?What does the nail colour indicate in health wise?
Mine are dark red so that wouldn't be a good sign...What does the nail colour indicate in health wise?
Condition Nail Appearance


Liver Diseases White Nails


Kidney Diseases Half of nail is pink, half is white


Heart Conditions Nail bed is red


Lung Diseases Yellowing and thickening of nail, and slowed growth rate


Anemia Pale nail beds


Diabetes Yellowish nails, with a slight blush at the base
If they are blue or white you're not getting enough oxygen.





Yellow = smoker..





That's all i got for now.
If you are getting the correct amount of vitamins and minerals, the skin under your nails should be a healthy pink and your cuticles should also look healthy.
You can't always narrow it down to a particular nutrient--but nails can indicate various health problems, for example:





Liver Diseases - White Nails


Kidney Diseases - Half of nail is pink, half is white


Heart Conditions - Nail bed is red


Lung Diseases - Yellowing and thickening of the nail, slowed growth rate


Anemia - Pale nail beds


Diabetes - Yellowish nails, with a slight blush at the base etc.