The best way to make sure that you are getting enough fibre in your body is by making fruit shakes. These consist mostly of frozen fruits. I recommend the use of berries and not just any frozen fruits. Consider mixing blueberries, raspberries, and blackberries. Raspberries can add a lot of sweetness to your fruit shake. Apart from acting as a sweetener, they will also help you achieve your 37-gram of fibre a day. A cup of a berry mix shake will give your body around 12 to 15 grams of fibre. This is a significant amount when working to consume 37 grams of fibre in a day.