I had a blood test and it gave hemoglobin = 15.6 g/dl (range 12 - 15 g/dl) and wbc = 4.43 k/ul (range 4.5 - 11 k/ul). someone told me my rb cells might be eating my wb cells. can that be? thanks a lot in advance?

There is no such condition and your hemoglobin is still within normal limit and same is your WBC count. There is a lot of misinformation in social media. You should trust your doctor.

What you were told is not correct. Your red cell and WBC counts are normal. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guideline