AIBU to only feed my child tomatoes...

[myotherusernameisalamborghini]

...because that is all he will eat?
DC is 13 months and after previously enjoying a wide variety of foodstuffs without issue, has suddenly decided that nothing is passing them lips except tomatoes. And preferably cherry tomatoes.
Occasionally I can sneak in something cleverly attached to a cherry tomato cut in half, maybe some banana or a bit of avocado or a small excerpt of biscuit. Mostly however it just ends up on the floor/my shirt/his socks/the cat.
It has been two weeks of him single-handedly supporting the local and/or world tomato industry.
Am I damaging his kidneys or liver or brain or something? Will his handful of teeth rot out and his corneas fade to red? Will he turn into a tomato?
Or can I just carry on feeding him only tomatoes until he changes his mind again, however long that may take?

It's not unreasonable as long as you're offering other things with it as well. Sometimes they go through stages like this but as long as you give them the opportunity to eat a normal diet then they will usually get over it.

Granted she also ate eggshell and wall plaster but that was only for a short time.

This made me lol. It is quite amusing to read all these stories.

Mermaid I think deep down that worries me too. He's very active and spends a good 9 out of every 10 minutes of the day running. Yesterday however he was a bit lethargic and although I've been a bit concerned about the Only Tomato Diet for a week or so the fact that he seemed to want to spend more time just lying on the floor staring into space made me think that maybe it could become a calorie issue.

I have however checked and he isn't red yet. :)

Don't get into food fights with him. I did with ds1 and it was hellish. He
was skinny at birth and I was very worried. Of course he's now 6 feet, well built, extremely healthy and loves cooking.

Try a small platter with halved tomatoes, stoned cherries, strawberries and on the surface of the tomatoes put dabs of cream cheese or peanut butter. Don't watch him eat and he may try some. Will he eat bread/toast/rusks at all?

A cautionary tale from me: -
DS2 had just turned 10 months and was being a bit of a fussy thing with food, though not as bad as yours op! He was refusing formula and the HV said he NEEDED to be on a multivitamin. He was eating quite a bit of veg though, a lot of carrot, tomato and yam....
A few days after forcing the multivitamin upon him I thought he might be jaundiced.
No, he was just orange.
Why?
The multivitamin he was taking was giving him a high dose of retinol, so all the beta-carotene in his diet wasn't being processed into vitamin a so his body was collecting it in his skin.
It's taken ages to fade, he still has a touch of the David Dickinson about him now, four months on. Thankfully carotinosis is harmless, but rather unsightly!

grey debatable nowadays. These days he either throws them on the ground immediately or walks around with it in his hand for a while until unceremoniously depositing in some random container in the vicinity. He has also tried to feed a biscuit to the cat.
Occasionally I have managed to sneak in a bit of avo or banana when placed on half a cherry tomato and distracting him once I've shown him it is a tomato, but something like cream cheese in impossible as I think the texture of it immediately alerts him to the fact that this is clearly not Pure Unadulterated Tomato. Good idea about the cherries though. Looks like a tomato if I get red ones. Maybe he won't notice and it will get some sugar into him. plans trip to cherry orchard

I agree with pps that it's likely to be a phase that he'll get through. I would put 3 or 4 different foods in front of him at each meal (including tomato), tell him what each one is, then sit down with him and eat the same but don't comment or make a deal over what he is or isn't eating. Eventually he'll start branching out.

Runs off to take own advice

What about red grapes? Small and gob sized.
Does he eat larger tomatoes too? I he eats chopped toms you could progress onto salsa or tinned toms with bread and butter to dip in. It's only when I read these type of posts I feel blessed that my two are the most unfussy kids ever (and realise it will only be a matter of time until that all changes ! )

You can't have any more tomato till you eat your biscuit...... one of those lines you never expected to have to say as a parent.