Watch a food eating contest!

Seriously, let's see. How about turn off all electronics. No tv, screens etc.

Spit some of it out?

I don't know. Drink ice water?

Read.

eat slower

Use a smaller plate.

Put your fork down between bites.

My first thought was put your fork down between bites too.

Eat standing up.

Drink water

Converse

I bet it is putting your fork down between bites also.

However, it could be not putting in the next mouthful before you fully swallow the last one!

Chew with your mouth closed?

Look at a fashion magazine.

chew each bite 30 times

eat in front of a mirror

eat alone

sit at the table to eat

Don't watch TV (or other distractions) while eating

Perhaps chat with a dinner companion.

Eat out?

Eat at home.

I've heard that a red dining room increases the appetite (don't know if that's true) so maybe another color decreases it so I'll say a blue room. Or maybe playing soft music.