Margaret looks like she’s in remarkable health. But she has one problem: She's in constant pain. She needs hip replacement surgery, but she's afraid of its consequences.

If you’ve ever started a new diet, you know that sometimes your health seems to get worse instead of better at first – even if the diet is good for you. Particularly if you’ve tried to cut back on a particular category, like sugar or even carbs in general, you’ll likely have some intense cravings. Other people experience some discomfort or fatigue as their bodies adjust to new forms of fuel.

Avoiding cancer can seem like an impossible task. After all,  genetics, uncontrollable environmental factors, and of course every bite of  food you take all seem to be at play. The sheer number of factors can be overwhelming.