According to Cancer Research UK, healthier diets could prevent one in 20 cancers.
What we eat and drink can affect our health in lots of ways, and we're often told to limit high calorie foods, sugary drinks and processed meat.
However, while eating healthily can potentially decrease the rate at which cancer grows, you should think carefully about exactly what you're eating.
One food thought to potentially pose a risk is salmon, a food heralded as a healthy option for all due to its high levels of omega fatty acid.
These widely-known health benefits are irrespective of whether the fish have been caught in the wild or farmed.
What kind of salmon poses a risk?
The concerns centre around farmed salmon, which experts think could be linked with an increased risk of developing prostate cancer.
A study from 2004 found that a group of man-made chemicals known as Polychlorinated biphenyl, or PCBs, were up to eight times more prevalent in farmed salmon than those caught in the wild, according to Harvard Health publishing.
While they have been banned for decades traces are often still found with the main place they crop up coming from food.
Hazardous waste sites are predominantly to blame for their release into the environment, the Environmental Defence Fund has explained.
With multiple cases of contamination then having been found amongst farmed salmon, scientists have warned eating them could lead to a greater risk of developing the illness.
Carcinogenic levels were found to be particularly high in British salmon, with the cheap farmed salmon that tends to dominate supermarket shelves potentially overall doing more harm than good for the person eating it, findings in the journal Science found.
Researchers said: “Risk analysis indicates that consumption of farmed Atlantic Salmon may pose health risks that detract from the beneficial effects of fish consumption."
Separate research published in another journal, Environmental Research, found that: “The biologic and toxic effect of PCBs and their metabolites are due in part to their ability to interact with several cellular and nuclear receptors, thereby altering signalling pathways and gene transcription.”
To test this, they carried out a study on 58 prostate cancers along with 99 controls. They found that: “In multivariate analyses, the odds of prostate cancer among men with the highest concentrations of moderately chlorinated PCB was over two times that among men with the lowest concentration.
“These results suggest that a higher burden of PCBs may be positively associated with an increased risk of prostate cancer."
Additional research also indicates that it could lead to higher levels of breast cancer.
Disputing these findings, the Illinois Department of Public health said: “There is no evidence that PCBs cause cancer at the low levels normally found in the environment.”
“Studies of human workers exposed to high levels of PCBs, have not consistently shown that PCBs cause cancer."
