Sugar does not directly cause cancer or cause cancer to grow faster. Glucose, a simple sugar, found in most carbohydrate foods (including added sugar, grains, cereals, beans, fruits, vegetables, and dairy) is the main energy source for all cells, including cancer cells. Just like healthy cells, cancer cells need a blood supply, oxygen and energy to grow. Limiting all sources of carbohydrate will not starve cancer cells and may negatively affect your healthy cells. Your body needs energy and may use your muscle and fat tissue for energy, which is not recommended.
Many healthy foods such as whole grains, cereals, beans, fruits, naturally contain sugar along with vitamins, minerals, fibre and phytonutrients. Eat a variety of foods and limit table sugar (white or brown), soft drinks, sweet baked goods (cookies, cakes) and processed foods that contain large amounts of added sugar.
You can read more about the sugar-cancer connection on the American Institute for Cancer Research website.