By weight, the average human adult male is approximately 60% water. However, there can be considerable variation in body water percentage based on a number of factors like age, health, weight, and sex.
How to claim medical tax deductions. Once you've totaled your medical expenses for the year, fill out the appropriate form in your tax return. If you include medical expenses in your itemized tax deductions, make sure to save your medical bills and payment statements as proof.
Jupiterimages/Creatas/Getty Images. You can't write off your personal medical bills as a business expense. Instead, you deduct medical expenses as a personal itemized deduction on Schedule A. Total your expenses, subtract 10 percent of your adjusted gross income, and whatever remains is your deduction. The tax law allows a few limited cases in which you can deduct medical spending from your business income.