I saved this link for a few reasons. One of them is to display an example of how you can do a headline without making it clickbait. "Some Tomatoes Have A White Ring Inside. How Dangerous Is It?" would be clickbait.
Have you ever cut into a tomato and been perplexed to see a white ring?
No. Oh, I've seen the white rings. I was just never all that curious about them. It just never occurred to me that it was anything but standard variation in quality.
One of the primary causes of a white ring is a potassium deficiency in the soil when the tomato is growing. It's important to have an adequate concentration of potassium because, without it, the fruits may not absorb enough magnesium and calcium to properly ripen.
ChEmIcAlzzz!!!
However, too much sun exposure can also lead to your tomato growing with pale tissue. If the fruits are left out in the open at temperatures higher than 85 degrees Fahrenheit, they may turn white or yellow, and some areas may end up being dry or shriveled.
Do what now? Okay, it's been a very long time since anything useful has grown near me, and even longer since I (or rather my parents) grew tomatoes, but I seem to remember "plant after last frost" and "plant in an area with full sun." And Potomac River basin temperatures stayed above 85F most of the summer, even before climate change started to accelerate.
I could be misremembering. Also, what with selective breeding and genetic engineering and whatnot, I'm pretty sure there are hardier varieties.
There are a few other reasons why you may see white flesh inside your tomatoes. If stink bugs, beetles, spider mites, and other bugs get under the fruits' skin and start feeding, they'll suck out the juice and insert their saliva, leading to a white spot rather than a white ring.
You know how it goes: what's worse than finding a bug in your tomato? Finding half a bug.
The good news is that if you spot a white ring inside your tomato caused by a potassium deficiency in the soil, it's typically safe to eat and can simply be removed by cutting...
And why would you want to cut it out if it's safe to eat? Well, "safe to eat" isn't the same thing as "appetizing." I routinely excise the stem parts from tomatoes, just because I don't like them.
Really, there's not much to this article, but it did sort of answer a question I never knew I had.