Nothing usually. I prefer to focus on solely the task at hand, even if it's just eating. I find that when I try to watch TV or videos while eating, I will simply end up not concentrating on either and then take forever to finish my food, or get nothing out of what I was trying to watch.

I read books/ebooks.

Or I read the back of the cereal box, over and over and over...

Watching tv shows or Youtube too. But I'm limiting myself to one full episode. Or if YouTube, I select a video in the 20~30 minutes range so it will last for the whole meal + small break after. And then I stop.

If eating alone (I usually eat in family), I'm usually listening to music. Past that... it depends, really. If I'm treating myself I'll probably just eat and listen to music, but if it's a "normal" meal I might do it in the front of the computer or TV while browsing or watching stuff.

I watch youtube/libretube or been watching StarTrek

Usually just browse the web on my phone or answer messages and emails.

Being on threads like these?

I will use my meal time to watch TV, listen to music, or talk on the phone.

If I'm with others, typically just focus on eating and fun conversation. Alone or just the wife and I, we usually watch something or chit chat.

Breathe. Answer texts. Drink water/beer. Tell my wife it's delicious. Tell my stepson to please turn the volume down on whatever device he brought to the table.

Or if you mean lunch, work. Also breathe.

I listen to the hottest tech news while I eat my Bretfast.

Assuming you're eating alone, play some quick show, like a brief podcast. Or try having less boring dishes so you enjoy them more

Photograph my food. It definitely beats saying grace (though I do that too).

Haven't done it recently only because I've run out of new meals to photograph.

Maybe you aren't eating the right foods? I am older so smaller calorie allocation now and honestly if I don't enjoy something I don't eat it. No room for crappy food.

Make or buy something healthy and so delicious you can enjoy it.

And music is a good accompaniment to food, that is engaging but won't make you mindlessly overeat.

For my work lunches, I either read a book or do some random sketching. Alternatively I go and buy something outside and go for a walk while eating my lunch. Some coworkers make a big thing about eating together, but I really can't do that every day.
At home I usually don't eat on my own.

YouTube, audiobooks, games, chatting with people on discord, talking to whoever I'm eating with.

usually watch something or sit outside watching stuff

You may want to look into something like Soylent. If I’m eating alone I’m usually flicking through Lemmy or watching something like you.