Dolly by Falstaff, fakir

There is a poem called simply "Dolly" by the author Axel Wallengren, also known as Falstaff, fakir. It goes like this:

Dolly, Dolly, har du hjärta?
Svara mig, du grymma snärta!
Nej, du har ej. Oh, vad smärta!
Därför går jag nu till Berta.

As far as I know there is no English translation of it, so I will do an attempt of my own to render as much of the eloquence as possible:

Dolly, Dolly, where's thy heart?
Answer me! Thou cruel art!
Oh, what pain, for thou hast none.
Therefore I'll to Betty run.

Brain Sport

The human brain accounts for only 2% of the body weight but it takes 15-20% of the body's energy consumption. Consequently, the most efficient way to lose weight must be to think really hard.

I'm not sure that is true, but it is worth thinking about.