There's one thing in common between the eating habits of our ancestors: no one counted carbs or fat. They simply ate the foods that were natural to their environment and experienced remarkable health. Living under these conditions for thousands of years led to genetic changes in each group that were then passed on to you and I.
The question whether obesity is solely caused by diet and lifestyle choices or whether a person's genetic make-up plays a role as well has long been debated among scientists without producing conclusive answers. One recently completed study tried to shed more light on this issue by following entire families over several generations.
Certainly women are driven to ask about genetic testing given a strong fear of breast cancer and a strong belief that early testing saves lives, but USPSTF feared many of the new customers lining up for the test would be classified as the "worried well" who would be unlikely to carry the rare genetic mutation and hence would receive no benefit from being screened.
The majority of sunscreens on the market today are more harmful than beneficial. Sunscreens are designed to decrease your risk of skin cancer and allow you to enjoy the sun without worry. Unfortunately, most modern day sunscreens may increase your risk of cancer and disrupt the functioning of your hormones.