I do cook!
I need your help, english speakers! I have a doubt with this construction: "Now I have a son so I do cook!"
What is the meaning of "DO + verb"?
Is it the same if I say "I have to cook"?

Thanks!

Question

I do cook!
I need your help, english speakers! I have a doubt with  this construction: "Now I have a son so I do cook!" 
What is the meaning of "DO + verb"?  
Is it the same if I say "I have to cook"?

Thanks!

Answer

This construct is used to emphasize the fact that something is being done.
It is usually in the context of a situation where the person did not do or have it before or there is what they do is being compared to something that they don't.
"You didn't like rock music."
"Oh, but I do like it now."

"I don't play tennis, but I DO play racquetball."
"I don't have any sons, but I DO have two daughters."