What triggers pain in one person may have no effect on another
For the millions in Britain living with arthritis, the search for relief has long extended beyond the clinic and into the kitchen. New warnings suggest that common foods like apples and tomatoes — carrying a compound called solanine — may quietly amplify the body's suffering, though science has yet to speak with one voice on the matter. At the same time, an unexpected discovery in diabetes medicine hints that the immune system's misdirected war on itself may one day be redirected. The story of arthritis remains one of incremental hope rather than singular cure.
- Millions of UK arthritis sufferers face daily pain with no cure in sight, making any potential dietary trigger a matter of urgent personal consequence.
- Warnings that everyday foods like apples and tomatoes may worsen inflammation have unsettled patients who assumed their diets were safe.
- The medical community is divided — while some researchers point to solanine as a culprit, bodies like the Arthritis Society Canada urge caution against sweeping dietary bans.
- A diabetes drug, Canagliflozin, has unexpectedly shown it may calm the immune cells that attack healthy tissue in rheumatoid arthritis and lupus patients.
- The emerging picture is one of personalised management — no single answer, but a growing toolkit of dietary awareness and repurposed medications.
Arthritis touches millions of lives across Britain with relentless pain, swelling, and the gradual loss of movement — and no cure exists. In the absence of one, researchers and physicians have turned increasing attention to diet as a means of managing what medicine cannot yet eliminate.
The Physicians Committee has flagged certain foods as likely pain triggers, with apples and tomatoes drawing particular attention. Both contain solanine, a compound associated with nightshade plants, and a survey of over a thousand arthritis patients found these foods — alongside red meat, sugar, and caffeine — were most commonly linked to worsening symptoms. Some patients who eliminated these items reported dramatic relief; in certain cases, symptoms faded almost entirely. A 2013 study lent partial scientific weight to this, finding that solanine exposure worsened joint damage in arthritic rats, leading researchers to suggest older women with arthritis consider avoiding nightshade plants.
Yet the science is far from settled. The Arthritis Society Canada has questioned these claims, declining to recommend blanket avoidance of tomatoes or apples. Their guidance is more cautious: pay attention to your own body, track your responses, and adjust accordingly — because what inflames one person's joints may leave another's untouched.
On a separate front, an accidental discovery has brought quiet optimism. Canagliflozin, a drug developed to manage blood sugar in type 2 diabetes, has been found to influence the T-cells responsible for autoimmune attacks on healthy tissue. For the more than 400,000 UK patients living with rheumatoid arthritis — and another 50,000 with lupus — this repurposed medication could offer meaningful relief, even if not a cure.
The path forward for arthritis sufferers is neither straight nor simple. It is built from small, personal adjustments — dietary experiments, emerging treatments, and the ongoing work of learning what each body needs.
Arthritis affects millions of people across Britain, delivering a relentless catalogue of pain, swelling, inflammation, and the slow erosion of movement. There is no cure. What doctors can do is manage the symptoms, and increasingly, researchers are looking at what people eat as a lever for control.
The Physicians Committee has identified certain foods as "pain triggers"—substances that, when consumed, appear to amplify the condition's worst effects. Apples and tomatoes sit near the top of that list. Both contain solanine, a compound found primarily in nightshade plants, the family that also includes potatoes and eggplants. The logic is straightforward: eliminate the trigger, and the inflammation may follow.
A survey of more than 1,000 arthritis patients pointed to a broader pattern. Red meat, sugar, fat, salt, caffeine, and nightshade vegetables emerged as the foods most commonly reported to worsen symptoms. For some people, the effect was dramatic. Research studies documented cases where patients who removed these items from their diet experienced significant pain reduction or, in some instances, saw their symptoms disappear entirely. The inflammation, it seemed, was tied directly to what was on the plate.
The scientific foundation for this claim rests partly on a 2013 study published in the Arab Journal of Nuclear Sciences and Applications. Researchers exposed solanine—a toxic compound produced in nightshade plants when exposed to light—to a group of 18 female postmenopausal rats with induced rheumatoid arthritis. The results suggested that eliminating nightshade vegetables could alleviate joint pain and slow tissue destruction. The researchers concluded that older women suffering from arthritis and joint swelling should consider avoiding these plants altogether.
But the medical community is not unified on this point. The Arthritis Society Canada has questioned the credibility of these assertions, stopping short of recommending that patients avoid apples and tomatoes outright. Instead, they suggest a more measured approach: individuals should monitor their own responses to solanine-containing foods and adjust their diets based on what they observe in their own bodies. What triggers pain in one person may have no effect on another.
Meanwhile, a separate development offers a different kind of hope. Scientists have discovered that Canagliflozin, a medication used to regulate blood sugar in type 2 diabetes, appears to influence T-cells—immune cells that normally fight infection but can mistakenly attack healthy tissue in autoimmune conditions like rheumatoid arthritis. This accidental discovery could benefit over 400,000 people in the UK living with rheumatoid arthritis, as well as another 50,000 with lupus. The medication does not cure these conditions, but it may offer relief by correcting the immune system's misdirected assault on the body's own tissues.
For arthritis sufferers, the landscape is shifting. Diet remains a tool of uncertain but real potential. New medications are emerging from unexpected quarters. The path forward is not a single answer but a series of small adjustments, each person finding what works for their own body.
Notable Quotes
If you have rheumatoid arthritis, a diet change could help you, and perhaps even eliminate your pain entirely— The Physicians Committee
Old age and postmenopausal suffering from arthritis and joint swelling must eliminate or avoid the nightshades plants to alleviate the joint pain— 2013 Arab Journal of Nuclear Sciences and Applications study
The Hearth Conversation Another angle on the story
Why would apples and tomatoes specifically be a problem? They're not even in the nightshade family.
That's the thing—they're not. But they do contain solanine, the same compound found in nightshades. The presence of the chemical matters more than the plant's taxonomy.
So the evidence is solid on this?
Not entirely. One rat study from 2013 is the main scientific anchor, and it was done on animals, not humans. The Arthritis Society Canada essentially said: we're not convinced enough to tell people to avoid these foods universally.
What does that mean for someone with arthritis right now?
It means paying attention to your own body. If you eat an apple and your joints feel worse the next day, there's your answer. If nothing changes, there's no reason to cut them out.
Is there anything else happening in arthritis treatment?
Yes. A diabetes drug called Canagliflozin is showing promise. It seems to calm down the immune cells that attack healthy tissue in rheumatoid arthritis. That could help hundreds of thousands of people.
So diet and medication working in parallel?
Exactly. One person might find relief by changing what they eat. Another might need the medication. Most will probably need both, or neither—it depends on the individual.