Hello,
I have completed my Bachelors and post graduate certificate in Human sciences, nutrition and public health. I do not have any sample articles with me at present as all the articles/ reports I have written are for my university assignments which I always get good grades (Distinctions and High Distinctions).
I can write on nutrition topics you like. As you require them for talks, i can provide the material in a presentation format or just as a essay and you can accordingly use it in your presentations.. If you need articles on healthy eating, exercise or even articles on the adverse effects of certain foods or the explaining about a disease and chronic illness, I can easily provide them.
as you will be using the material for a talk, the articles would be around 700-1000 words with numerous examples or information that is easy to grasp for the live audience.