Find what interests you. Many other grad students are much younger than I am and will be entering a life's career following completion of their studies. Looking back, I think it's important to pursue your passion and let the career, money, etc., come from that. During studies, stay on top of things. At the same time, don't neglect other outlets, pursuits, interests: things have a way of connecting in unexpected ways.
While it's true that you should work hard to reach your goal, burnout is real. Allow yourself to take breaks when needed; take a nap, play video games, and laugh at some memes. Life will feel less annoying.
I chose to complete my grad studies at Guelph because of the faculty in the School of Environmental Design and Rural Development and the connections that the University has to several provincial ministries and government organizations.
We have AMAZING faculty for cardiovascular research, as well as nutrition, exercise and food science. If you're trying to choose universities and advisors, come drop by Guelph- chat to the professors, other lab members, our support staff. You'll see the difference yourself and be able to make an informed decision!
My first piece advice to prospective grad students would be to find a lab or an advisor that you mesh well with and are excited about working with. If you are on the same page and feel comfortable from the start, it makes all the difference. After that, trust yourself and your abilities! You are capable of more than you think.
Being a graduate student at the UofG was an amazing and rewarding experience. Fellow students and faculty create a friendly and supportive environment which made coming to the lab enjoyable, every day. Between presenting at conferences, writing papers and conducting research, UoG offers plenty of amenities to relax and unwind with friends.
The faculty profiles page, on the Food Science Department website, is very useful to help find research projects that you may be interested in. Do not hesitate to email or talk directly to the faculty members. They are always welcoming, and can even help you apply for scholarship funding!