Tag Archives: pesticide

Population growth: limited by pesticides?

The United Nations (UN) forecasts the world population to reach 9.3 billion by 2050. According to them, a 60% increase in food production will be required to sustain the population.

Solution: increasing pesticide use.

Unsplash Photo by @Arjun MJ (Ernakulam, Outdoors)

Unsplash Photo by @Arjun MJ (Ernakulam, Outdoors) Unsplash

Pesticides are chemicals that repel or kill weeds and organisms that affect plant growth. 

The United States first introduced pesticides in the 1930s (during the Great Depression when the population was 2 billion) because of their considerable increase in yields. Since then, according to the World Health Organization (WHO), over 1000 types of pesticides are used globally today.

Many people stand by organic products, which use minimal pesticides. There are several reasons why people opt out of consuming products grown with pesticides:

Many synthetic pesticides cannot be broken down by humans or animals. Because of this, they bioaccumulate (simply substances that become concentrated in living organisms) as body fat.

Pesticides also pose a huge threat to aquatic ecosystems. They contaminate ground and freshwater supplies used by wildlife, livestock, crops and people.

In 2020, Boedeker et al in the BMC Public Health Journal, estimated about 385 million people annually get pesticide poisoning.

These are only three reasons why people don’t like pesticides, but there are many more.

With that said, pesticides were first introduced to solve an issue in 1930 – an issue that will soon present itself again: food shortage. 

There’s an interesting theory called the Malthusian Trap, which describes how increased agricultural production as a result of advanced agricultural techniques increases the population. But with a greater population, there’s a greater need for consumption, and that strains the food supplies. 

Based on a 2017 study of European farming systems, if pesticides were removed from agricultural practice, there could be a 78% loss in fruit production, a 54% decrease in vegetable harvest and a 32% loss in grain yields.

Pesticides provide greater food output, increase farmers’ earnings, improve practice, prevent diseases, and allow cultivation in areas that would otherwise be uncultivable. 

Simply, they allow farmers to grow more food on less land, raising yield. 

According to a 2005 study by CropLife Foundation, without fungicides in the US, fruit and vegetable yields would decrease by 50-90%. For perspective, 40.3% of Canada’s fruit is imported from the US. This is similarly the case in Mexico, South Korea, and Japan, all countries with high populations. Without pesticides, these countries would experience significant food shortages due to their reliance on the US and their pesticides. 

 

Are Your Non-Stick Pans Casing Celiac Disease?

Recent discoveries suggest persistent organic pollutants (POPs) may increase the likelihood of celiac disease, especially in females. 

What is celiac disease? 

Celiac disease is an autoimmune disorder where the small intestine reacts negatively to the wheat protein (gluten) in foods containing white, rye, and barley. The current solution for celiac disease is to follow a gluten-free diet. Celiac disease is believed to be genetic, however, some research suggests a possible environmental connection. 

Research from the New York University School of Medicine found that high levels of Persistent organic pollutants (POPs) in blood samples correlate to an increased likelihood of a celiac disease diagnosis. 

POPs are toxic chemicals generated by human activity. Examples of POPs include polybrominated diphenyl ether (PBDEs), perfluoroalkyl substances (PFASs), and p,p’-dichlorodiphenyldichloroethylene (DDE). These pollutants are found in all aspects of daily human life and serve many purposes, as shown in Table 1. 

Table 1: Common POPs’ Location and Function 

Spraying pesticides on bananas in the 1980s | Location: Big … | Flickr

Pesticides used in fruit farming occasionally contain DDE (Credit: Scot Nelson, Flickr)

In a study of 88 patients from NYU Langone’s Hassenfeld Children’s Hospital outpatient clinic, blood samples were measured for the aforementioned POPs. Subsequent testing for celiac disease was also performed and resulted in 30 patients receiving positive results. 

As seen in figure 1, the concentration of POPs in patients with celiac disease is slightly higher than in “healthy” patients. When age, BMI, sex, and genetic predisposition are accounted for, DDE was correlated with a two-fold increase in celiac disease diagnosis. 

Figure 1: PBDE, PFAS, and DDE Median Concentrations in Celiacs vs. Non-Celiacs. These bar graphs compare the median blood concentrations of various POPs in patients diagnosed with celiac disorder and non-celiacs. Notably, this figure does not account for age, sex, genetic predisposition, and BMI. (Credit: Carissa Chua, Modified from Gaylord, et. al.)

When separated by sex, PFAS pollutant concentration was found in higher concentrations in females with celiac disorder. Similarly, men with celiac disorder displayed higher levels of PBDEs. While this discovery is interesting, a more thorough, sexually stratified study should be performed using a greater sample size. 

Gluten free bread | ????????Professional Photographer ????Twitch C… | Flickr

Attempting to avoid these pollutants may complement a gluten-free diet (Credit: Marco Verch, Flickr)

Continued exploration into the interaction between POPs and celiac disease should be performed to definitively prove any relationship. However, attempting to cautiously avoid toxic pollutants as mentioned above may be a helpful addition to a gluten-free diet. 

 

 

 

-Carissa Chua