Slightly Fat

I heard about a study
Which had proof that where it’s at,
In terms of living longest,
Is to be just slightly fat.

When one weighs sixty pounds too much,
That person is obese.
The chances of a lengthy life
Have started to decrease.

But someone who is overweight
By up to thirty pounds
May outlive all the skinny folk,
As crazy as it sounds.

There’s cause for celebration
For the chubby and the plump;
And dieters may pack it in,
For science holds the trump!