While I am not a hard-core advocate of seasonal eating, I do try to lean in that direction when possible. For a simple example, I eat more potatoes and squash (heavy, cooked foods) in the winter, and more fresh raw salads (light, raw foods) during spring and summer.
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As a vegetarian (who tends toward the vegan side), I've done my share of moderating the guidelines in that respect as well as following my own bodily constitution. Our individual constitutions may lead us to avoid some foods while increasing others, so it's important to know your innate nature. Another personal guideline is to feel into the landscape around you. Do you live in a hot, dry climate or a cool, wet one? That can influence which foods you will be able to digest well.
There are so many aspects to giving our bodies what they need, but don't wait any longer. I encourage you to dip your toes in the waters right now and explore!