Whether you needs pills or not is up to doctor and you.
AACE - American Association of Clinical Endocrinologists 2006 amended guidelines
US Government 2004 Guidelines
UK 2006 Guidelines
American Thyroid Association
The Endocrine Society - Albert Einstein College of Medicine, New York. September 23, 2004.
quote - TSH of 4.5 to 10: No routine levothyroxine treatment for patients with TSH levels between 4.5 and 10 mIU/L, but thyroid function tests should be repeated at 6- to 12-month intervals to monitor for improvement or worsening in TSH level. Early levothyroxine therapy does not alter the natural history of the disease,.........
TSH Higher Than 10 mIU/L Hypothyroidism Levothyroxine therapy is reasonable.
Data do not confirm clear-cut benefits for early therapy....... develop. - unquote
If you are feeling good without symptoms, you might discuss the above with your doctor. Your doctor might have reasons for putting you on meds., perhaps due to health, I mean he knows you better than anyone, your health that is.
Diet or exercise never hurts, but I don't believe its a cure-all.
If you/doctor decide against meds. for now, have thyroid levels checked at least annually for eventually levels might get worse to where you would need meds.
By the way, I was healthy and pill free, even aspirin, most of us were. Nothing wrong taking a tiny pill that replaces hormone that very part of our body needs. And thank God that there are pills available. I don't consider (my) thyroid as being sick or unhealthy for back when they didn't have pills/treatment, that WAS being sick.
Good luck with your choice, I am sure it will be a wise one, and continuous best of health.
Do you have any symptoms? Why did doc check thyroid levels?