Want to know just how much dairy is too much, and whether or not a vegan diet is always healthier? The right diet can help you on your way to living a long and healthy life. That's why we've rounded up the best diet-based tips to increase your chances of remaining happy and healthy into old age.

Click or scroll through our gallery to see what foods to eat (and avoid) for a longer, healthier life – counting down our most important recommendation of all.

We've based our ranking on the ease and health-boosting credentials of each tip, as well as on the opinions of our team. The list is unavoidably subjective. Consult a doctor before making any major lifestyle changes.

The best foods to eat and avoid for a longer, healthier life