The phrase "certain types" refers to specific kinds or categories of things or people. It suggests that not all things or people are included, but only those that match specific criteria. Full definition
Further, soy protein powder is said to be capable of lowering the risk of certain types of cancer and cardiovascular diseases. (nupush.net)
They may also sustain ideas that breast feeding is a difficult activity, likely to fail, or that it is an option only for certain types of women. (bmj.com)
Omega 3s are also know to improve cognitive function, improve mood, offer joint protection, promote eye health, and a decreased risk in certain types of cancer. (theharvestkitchen.com)