Science says maybe!
Which is why it's more than a little frustrating to find out all of that 'research' has been misrepresented, misconducted, or just plain wrong.
"In 2009, a German group did a painstaking meta-analysis of all studies on overweight and obesity that they could find. As with most other researchers, they found that being overweight was good for you. Of course, they didn't phrase it in this way. They said: "The prevailing notion that overweight increases morbidity and mortality, as compared to so-called normal weight, is in need of further specification."
And this wasn't just one isolated incident. Multiple studies are discovering that the weight range widely considered to be 'normal' is actually not associated with a greater life expectancy.
It doesn't stop there!
What does this tell us about the health problems of having a BMI of 31? Well, absolutely nothing."
That doesn't mean reach for a milkshake.
Excessive sugar is still probably not great for you. What this could mean is that our research into mortality and weight has been flawed for a long time, and that the causes of weight gain might not be an unhealthy lifestyle- they could mean the opposite. My takeaway is that I need to spend less energy worrying about the mirror, and more time eating healthier foods and getting exercise.