It’s difficult to prove that certain foods cause cancer.
Sugar and Refined Carbs
Processed foods that are high in sugar and low in fiber and nutrients have been linked to a higher cancer risk (2).
In particular, researchers have found that a diet that causes blood glucose levels to spike is associated with an increased risk of several cancers, including stomach, breast and colorectal cancers (4, 5, 6, 7).
It’s thought that higher levels of blood glucose and insulin are cancer risk factors. Insulin has been shown to stimulate cell division, supporting the growth and spread of cancer cells and making them more difficult to eliminate (9, 10, 11).
In addition, higher levels of insulin and blood glucose can contribute to inflammation in your body. In the long term, this can lead to the growth of abnormal cells and possibly contribute to cancer (9).
This may be why people with diabetes — a condition characterized by high blood glucose and insulin levels — have an increased risk of certain types of cancer (12).
For example, your risk of colorectal cancer is 122% higher if you have diabetes (13).
To protect against cancer, limit or avoid foods that boost insulin levels, such as foods high in sugar and refined carbs (14).
Processed meat refers to meat that has been treated to preserve flavor by undergoing salting, curing or smoking. It includes hot dogs, ham, bacon, chorizo, salami and some deli meats.
Observational studies have found an association between consuming processed meat and an increased cancer risk, particularly colorectal cancer (16).
A large review of studies found that people who ate large amounts of processed meat had a 20–50% increased risk of colorectal cancer, compared to those who ate very little or none of this type of food (17).
However, these studies often don’t distinguish between processed meat and unprocessed red meat, which skews results.
Cooking certain foods at high temperatures, such as grilling, frying, sautéing, broiling and barbequing, can produce harmful compounds like heterocyclic amines (HA) and advanced glycation end-products (AGEs) (25).
Certain foods, such as animal foods high in fat and protein, as well as highly processed foods, are most likely to produce these harmful compounds when subjected to high temperatures.
These include meat — particularly red meat — certain cheeses, fried eggs, butter, margarine, cream cheese, mayonnaise, oils and nuts.
One study followed almost 4,000 men with prostate cancer. Results found that high intakes of whole milk increased the risk of disease progression and death (32).
More research is needed to determine possible cause and effect.
Theories are that these findings may be due to an increased intake of calcium, insulin-like growth factor 1 (IGF-1) or estrogen hormones from pregnant cows — all of which have been weakly linked to prostate cancer (33, 34, 35).
Summary Higher consumption of foods rich in sugar and refined carbs, as well as processed and overcooked meat, can increase your risk of cancer. In addition, higher dairy consumption has been linked to prostate cancer.
Source : https://www.healthline.com/nutrition/cancer-and-diet