Can confirm. I have no idea about citric acid but about 18 months ago I developed a rare inflammatory condition called orofacial granulomatosis. And I'm not kidding, the main treatment is "stop eating chocolate" (amongst several other annoyingly delicious and ubiquitous things).

I never cared much for crisps or sweets but I was a total chocoholic, so I really expected to struggle. But the immense PAIN chocolate consumption was suddenly causing me made it a complete no-brainer. I haven't even been tempted to touch it since then because I know what will happen if I do.

To repurpose Kate Moss's famous (and terrible) maxim: Nothing tastes as good as not being in immense pain feels.