Yes, because they contain more than fibers which will promote intestinal transit and thus limit the time of exposure of the intestinal mucous membranes to carcinogenic substances from our food. The Whole grains (wholemeal bread, wholemeal pasta in particular) thus participate in the prevention of colorectal cancer. The full version is also richer in minerals and trace elements.
In practice
Choose them organic if possible (cereals from traditional agriculture are kept in silos where pesticides are used), especially for children.
Opt for mixtures of cereals (muesli type) in order to benefit from the nutritional characteristics of the different cereals.
Choose them raw (no added sugar or fat).