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Opinions Jaap Haanstra

Are we banning glyphosate or Parkinson's?

24 December 2025 - Jaap Haanstra - 26 comments

Parkinson's patient Rendert Algra (62) is astonished that Brussels is significantly relaxing pesticide rules. He said this in the December 18 edition of the Telegraaf newspaper. Algra is convinced that he became ill because he worked with the herbicide glyphosate for years. Algra is quite a mouthful.

If glyphosate or another substance were to cause Parkinson's disease, we in agriculture need to get rid of it as quickly as possible. I'm an arable farmer, I work with that substance, and it's concerning my health. My children also work on the farm, and my grandchildren are around. Farmers don't want to risk themselves, their loved ones, and the environment developing Parkinson's disease from glyphosate.

Parkinson's disease is something no one would wish on anyone, and everyone would benefit from a quick solution to this dreadful disease. But we won't find that solution if we blame someone – the use of glyphosate (by farmers) – just because we think we do. 

Researcher Marc Jacobs
Besides being an arable farmer, I'm also chair of the board of the Agrifacts Foundation. This foundation raises funds for research projects related to agriculture and horticulture. Researcher Marc Jacobs proposed a research project to identify all risk factors for Parkinson's disease. He wanted to look at pesticides, but also at all other risk factors that have been studied. We awarded this project.

Jacobs analyzed no fewer than 885 scientific studies on factors that increase the risk of Parkinson's disease. These were global studies spanning a period of 65 years.

Parkinson's is a typical disease of old age. As the population ages, we will see more and more of this disease. Hereditary factors also play a role. Furthermore, the 885 studies revealed as many as a hundred different risk factors.

In all cases, the risks were very low. No risk factor showed a clear correlation. For example, slightly increased risks were observed for constipation, depression and anxiety disorders, some infections and inflammations, some pesticides (never used in the Netherlands or already banned), and certain nutrients. Notably, smoking and coffee consumption slightly reduced the risk of Parkinson's.

Global Studies
Jacobs then specifically examined global scientific studies on glyphosate and Parkinson's. However, these studies also showed no connection. Furthermore, a Chinese study recently appeared that showed a slight link between Parkinson's and a high intake of ultra-processed foods. There appear to be numerous potential risk factors, but no clear link.

Politicians like to link Parkinson's to glyphosate and other pesticides used by farmers. It's good that research is being conducted into pesticides that have harmful effects on health. As an arable farmer, I want to know about this; I don't want such pesticides on my farm. However, I do wonder if these politicians, including Rendert Algra (CDA), want to ban glyphosate or Parkinson's disease.

To ban glyphosate, consistently identifying this product as the culprit is the political route. However, if we truly want to halt Parkinson's disease, we must focus on all risk factors. A broad perspective is essential, ensuring nothing is overlooked. It's not about opinions, it's about facts.

Jaap Haanstra

Jaap Haanstra is an arable farmer in Luttelgeest and chairman of the AgriFacts Foundation. In addition, he has worked for various agricultural organizations over the past 30 years. Haanstra writes his columns in a personal capacity.
Comments
26 comments
Subscriber
Noord 24 December 2025
This is in response to it Boerenbusiness article:
[url = https: // www.boerenbusinessAre we banning glyphosate or Parkinson's?
Algra says more. He states that glyphosate was used in the past to control thistles. Anyone with a little common sense knows that glyphosate wasn't used for that purpose and is
Subscriber
The Frisian 24 December 2025
That's right, he often gets the platform to air his suspicions, perhaps he's had one too many too many in the past, which has proven to be bad.
Subscriber
CM 24 December 2025
Politicians think that if we keep raising suspicions about Roundup, we'll eventually manage to ban it. We don't listen to facts, but they're very useful in banning all substances, if possible.
Subscriber
gerard 24 December 2025
Then we certainly shouldn't eat soy because it's definitely in there. Most people don't run on facts but on suspicions. Like Simon Rosendaal says, everything is poisonous, but the doses determine it.
Subscriber
25 December 2025
That was a statement by the physician Paracelsus in the 15th century: It's not the nature of the substance that's poisonous, but the amount. According to recent scientific research, we're ingesting quite a bit of glyphosate these days, so...! Perhaps we can agree that consuming 2 grams of carbide isn't harmful, but 1 kg is.
Student godfather 25 December 2025
The biggest driver of Parkinson's is stress and old age. Government policy, with its numerous regulations, unattainable goals, etc., causes a great deal of unrest and stress for many farmers. If this stress persists too slowly, it has a significant impact on your health. If you have Parkinson's, this stress is the driving force behind it. And it's rearing its ugly head. It's incomprehensible that these studies aren't being shared and that farmers are once again being blamed for everything.
Subscriber
Arie poor branch. 25 December 2025
Student Peter wrote:
The biggest driver of Parkinson's is stress and old age. Government policy, with its numerous regulations, unattainable goals, etc., causes a great deal of unrest and stress for many farmers. If this stress persists too slowly, it has a significant impact on your health. If you have Parkinson's, this stress is the driving force behind it. And it's rearing its ugly head. It's incomprehensible that these studies aren't being shared and that farmers are once again being blamed for everything.
You're twisting things around too easily. Instead of claiming, as many believe, that Parkinson's is caused by pesticides, among other things, you claim it's caused by stress farmers experience over pesticide management. This is incredibly simplistic, especially coming from a student.
Subscriber
25 December 2025
No, dear student. Glyphosate is being blamed, and farmers are using it for economic gain. I won't go into the actual stressors farmers face.
Farmer Harm Peet. 25 December 2025
I believe the student's story. We experience much more stress than before because of all the regulations. And the average age of farmers is much higher. It's more common at older ages, especially among people who experience a lot of stress, and unfortunately, politicians saddle us with a lot of stress. This incitement against farmers should be banned.
Subscriber
25 December 2025
Stressors include a complete lack of adaptability. They want everything to remain as it is, but that's nowhere to be found. Nothing remains permanent; everything flows. And then, for many, there's the bank, which monitors the financial consequences of restrictive (manure) regulations. Now that's stress! Did you hear what Peter Wennink says in his report? We can expect adaptation from a sector responsible for 64% of total nitrogen emissions and contributing only 0,4% to our income.
Pastor 26 December 2025
Wennink is speaking for the converted. Just like most people. Chips are being found in war materials in Ukraine. Shouldn't this be banned?
Subscriber
Southwest 26 December 2025
wrote:
Stressors include a complete lack of adaptability. They want everything to remain as it is, but that's nowhere to be found. Nothing remains permanent; everything flows. And then, for many, there's the bank, which monitors the financial consequences of restrictive (manure) regulations. Now that's stress! Did you hear what Peter Wennink says in his report? We can expect adaptation from a sector responsible for 64% of total nitrogen emissions and contributing only 0,4% to our income.
No, we're not allowed to. Other sectors can pass on costs, we have to pay all sorts of fees, but (we're price takers!) we're gradually getting little to nothing. There's no room, regardless of the value of those studies. The conclusion is set, and research is being written accordingly.
Subscriber
Roy 26 December 2025
That report is, of course, complete nonsense. How dare you bring this up here again? We've been talking about this whole nitrogen issue for six years now; it can be dismissed in an hour. Be practical and don't keep going around in circles theoretically. How hard can it be?
Subscriber
Jo 26 December 2025
In Missouri, three farmers were compensated by Monsanto for cancer. It was then quickly sold to Bayer, which has already settled for $10 billion. $25 billion is on the way. If author Haanstra really doesn't want to harm his health, he could also look into farmers' sperm quality. Or does he have a different interest with his Agrifacts foundation?
Democrat 26 December 2025
America, you call me a country. I think they've completely lost their way there. But then again, they've got some really old people at the top lately. The stress they're all under isn't doing their minds any good.
Subscriber
juun 26 December 2025
jo wrote:
In Missouri, three farmers were compensated by Monsanto for cancer. It was then quickly sold to Bayer, which has already settled for $10 billion. $25 billion is on the way. If author Haanstra really doesn't want to harm his health, he could also look into farmers' sperm quality. Or does he have a different interest with his Agrifacts foundation?
Does a judge do cancer research? Especially in the US, you can easily convince a jury that you're a pathetic judge. You'd quickly win against a large corporation.
Subscriber
CM 26 December 2025
The litigation culture and legal system in the US and here in Europe, and especially the Netherlands, are completely incomparable. Moreover, resistant corn and soybean crops genetically engineered to be treated with Roundup are widely grown there. This doesn't happen here in Europe or the Netherlands. The approval requirements here stipulate that it's not applied to crops that will later be consumed. Vegetarians, through their direct use of soy, are perhaps the most likely to come into contact with Roundup, as much of it is imported from the US.
Subscriber
ideas 26 December 2025
After 2000 the R-up patent was cancelled. How can you blame Bayer for everything then?
Term 27 December 2025
idea wrote:
After 2000 the R-up patent was cancelled. How can you blame Bayer for everything then?
That is probably no more difficult than the fact that there is a lot to be gained from Monsanto and Bayer.
Hub Rich 27 December 2025
Arie poor branch. wrote:
Student Peter wrote:
The biggest driver of Parkinson's is stress and old age. Government policy, with its numerous regulations, unattainable goals, etc., causes a great deal of unrest and stress for many farmers. If this stress persists too slowly, it has a significant impact on your health. If you have Parkinson's, this stress is the driving force behind it. And it's rearing its ugly head. It's incomprehensible that these studies aren't being shared and that farmers are once again being blamed for everything.
You're twisting things around too easily. Instead of claiming, as many believe, that Parkinson's is caused by pesticides, among other things, you claim it's caused by stress farmers experience over pesticide management. This is incredibly simplistic, especially coming from a student.
Dear Arie, "Student Peter" subtly says something different. He's talking about a trigger. In other words: Parkinson's can have a specific cause. And then that manifests itself or accelerates its manifestation due to stress. I don't know if that's true, by the way. NGOs are getting their teeth into glyphosate. In my opinion, they're not targeting the worst enemy. A 25-year-old scientific article was recently retracted. But even if this shifts glyphosate from "absolutely safe" to "carcinogenicity cannot be ruled out," that's not a big deal. Products containing PFAS (or converted into them) in agriculture or elsewhere would be better targets.
Subscriber
It can freeze or thaw 27 December 2025
Huib Rijk wrote:
Arie poor branch. wrote:
Student Peter wrote:
The biggest driver of Parkinson's is stress and old age. Government policy, with its numerous regulations, unattainable goals, etc., causes a great deal of unrest and stress for many farmers. If this stress persists too slowly, it has a significant impact on your health. If you have Parkinson's, this stress is the driving force behind it. And it's rearing its ugly head. It's incomprehensible that these studies aren't being shared and that farmers are once again being blamed for everything.
You're twisting things around too easily. Instead of claiming, as many believe, that Parkinson's is caused by pesticides, among other things, you claim it's caused by stress farmers experience over pesticide management. This is incredibly simplistic, especially coming from a student.
Dear Arie, "Student Peter" subtly says something different. He's talking about a trigger. In other words: Parkinson's can have a specific cause. And then that manifests itself or accelerates its manifestation due to stress. I don't know if that's true, by the way. NGOs are getting their teeth into glyphosate. In my opinion, they're not targeting the worst enemy. A 25-year-old scientific article was recently retracted. But even if this shifts glyphosate from "absolutely safe" to "carcinogenicity cannot be ruled out," that's not a big deal. Products containing PFAS (or converted into them) in agriculture or elsewhere would be better targets.
Indeed, half of the Netherlands is already stressed out and struggling with all sorts of complaints. The reason is simple: we want everything, we want to know everything, we have to be available 24/7, and if something goes wrong, there's immediate panic. We believe we should live in a controllable society where unexpected things shouldn't happen. And if there's someone, a so-called expert who also has their own platform, then you can fill in the rest yourself.
Subscriber
Term 27 December 2025
Huib Rijk wrote:
Arie poor branch. wrote:
Student Peter wrote:
The biggest driver of Parkinson's is stress and old age. Government policy, with its numerous regulations, unattainable goals, etc., causes a great deal of unrest and stress for many farmers. If this stress persists too slowly, it has a significant impact on your health. If you have Parkinson's, this stress is the driving force behind it. And it's rearing its ugly head. It's incomprehensible that these studies aren't being shared and that farmers are once again being blamed for everything.
You're twisting things around too easily. Instead of claiming, as many believe, that Parkinson's is caused by pesticides, among other things, you claim it's caused by stress farmers experience over pesticide management. This is incredibly simplistic, especially coming from a student.
Dear Arie, "Student Peter" subtly says something different. He's talking about a trigger. In other words: Parkinson's can have a specific cause. And then that manifests itself or accelerates its manifestation due to stress. I don't know if that's true, by the way. NGOs are getting their teeth into glyphosate. In my opinion, they're not targeting the worst enemy. A 25-year-old scientific article was recently retracted. But even if this shifts glyphosate from "absolutely safe" to "carcinogenicity cannot be ruled out," that's not a big deal. Products containing PFAS (or converted into them) in agriculture or elsewhere would be better targets.
Pesticides containing PFAS will soon be banned. You can see that from all the media reactions. Incidentally, I wonder if PFAS is really that harmful. A lot of PFAS is also released directly into people and therefore into the environment through medications (https://www.vzinfo.nl/genees-en-hulpmiddelen-en-lichaamsmaterialen/volgen), thousands of kilos per year. And haven't they all been thoroughly tested? That doesn't mean, however, that I think it's very smart to introduce chemicals into the environment that are almost impossible to break down.
Subscriber
gerard 27 December 2025
How is it possible that people who don't use it get the disease while users don't? This also applies to Cu fever in goats. Hundreds of people visit goat farms. One person gets it, the other doesn't. It's fate.
Subscriber
CM 27 December 2025
gerard wrote:
How is it possible that people who don't use it get the disease while users don't? This also applies to Cu fever in goats. Hundreds of people visit goat farms. One person gets it, the other doesn't. It's fate.
That remains elusive, but some people are simply more susceptible to something than others. You see it with lung cancer in non-smokers and 90-year-olds who have smoked and drunk their entire lives. Children aged 1 or 2 who die from a certain disease also experience something similar.
Subscriber
Hypark 29 December 2025
There's also a difference in the chain structure between PFAS and PFAS. One is harmful, the other isn't. Because of all the emotions, I haven't heard or read anything about that. I hope everyone isn't being tarred with the same brush. There are also harmless PFAS pesticides.
Subscriber
juun 29 December 2025
I think it's mainly about TFA formation. There's a big difference between the active ingredients there. Fluopyram is probably in the doghouse in that regard. If that's the case, the latter chemical nematode product is also banned.
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