Strangely enough, prior to 1900, there were almost no overweight humans walking the land. Moreover, some made money in a circus to show their fat to spectacles who paid for it.
It was very hard to put enough weight and be accepted in a circus job back then.

Why now is the opposite? Something has changed. 
We all know what to do! Everybody does! It is simple logic. You can see this well in the game of Survivor. All players lose weight!

How? Is it a special diet? Maybe exercises or yoga? It's so obvious!

Ok, so nowadays we eat more than in the past or in the past, they ate less than now. But why? Was it a discipline? Maybe a food shortage...  
or maybe food just didn't taste so good!

All those spices, recipes books, cooking shows etc... we can cook amazing killer meals! Food is so delicious, we cannot stop even when we had kinda enough! 
Oh, this chicken is yum! I will have one more piece! 

150 years ago this chicken wasn't that delicious.
We are trapped, it is very hard not to have a nice little taste of yummy salami if it's just there in a fridge. Open the door, see the light at night, smell and bite!

OK then, there is a food that will never rise your lbs. It is delicious, soft, lightweight and welcome to have a huge bowl of it before going to bed!