Body replacement

• 98% of atoms in the human body are replaced every year.

• Lungs are 6 weeks old
• Liver is 5 months old
• Taste buds: 10 days
• Heart age: 20 years
• Lungs: 2-3 weeks
• Skin: 2-4 weeks
• Bones: 10 years
• Nails: 6-10 months
• The fastest-changing component, says Dr. Aebersold, is water. It forms about 70% of the body, and about half the water molecules are replaced every eight days.
• Body's cells largely replace themselves every 7 to 10 years.

This is Dec 2017 and I weigh around 58 kg. Last year Dec 2016 I had the same weight. I had 2% (1.16 kg) left from last year, and I got  new 56.84 kg in one year - which came from food, air we breathe, drinks etc.