Potatoes and yams are "stem tubers". Sweet potatoes and cassava are "root tubers". Some people use the word 'tubers' to mean only stem tubers. Others refer to both stem tubers and root tubers as 'tubers' collectively. I prefer the latter convention for simplification. Why? In nutrition literature, we tend to cluster all of these together as starch rich food sources: potatoes, yams, sweet potatoes, cassava.

Wikipedia article on Tuber explains:

Yes! Tubers are an awesome food group in Whole Food Plant-Based guidelines!

Potato Lectures by Dr McDougall: Insightful lectures that explain why potatoes (and sweet potatoes and yams) are underappreciated superfoods.

Tubers in History: Tubers like potatoes, yams & sweet potatoes have been an integral part of several cultures worldwide. The most notable are probably the Okinawans, one of the Blue Zone cultures. They consumed upwards of 65% of their calories from one specific plant: purple sweet potatoes!

Potato Diabetes Connection: Are potatoes really bad for chronic lifestyle diseases like diabetes and hypertension? This is a longstanding debate in nutrition circles going back several decades. The crux of the matter is described in Dr Greger's webinar and also in Jeff Novick's article.

The Potato Hack: A short-term intervention called The Potato Hack is an effective weight loss technique! The idea is to consume only cooked potatoes (baked or boiled) every day for a few weeks. The ideas has been employed be celebrities like Penn Jillette of Penn & Teller magic show fame.

Are Potatotes & Sweet Potatoes Satiating? Yes! We feel full after eating them. In fact, boiled potatoes were found to be the most satiating food in a study.

Potatoes: Is Acrylamide A Concern? In his early videos from 2008, Dr Greger expressed concerns with acrylamide in french fries made from potatoes. In his 2021 webinar on potatoes, he mentioned that the acrylamide produced by baking potatoes is a non-concern.

Potatoes and Glycoalkaloids: Glycoalkaloids are a non-concern if we remove the green parts of raw potatoes, along with any 'eyes' that may have developed. But if we consume large quantities of potatoes, for example, in a Potato Diet or Potato Hack, Dr Greger advises peeling them.

Potatoes: Green Light Or Yellow Light? Potatoes are encouraged by all Whole Food Plant-Based doctors like Dr McDougall and Dr Fuhrman. However, Dr Greger calls them a 'yellow light food', to be eaten in moderation. Sweet potatoes are much better!

How To Improve The Nutritional Quality Of Potatoes?

Sweet Potatoes explains the health benefits of sweet potatoes, which are underappreciated superfoods! They awesome in both taste and nutrition! The Okinawans derived 69% of their calories from purple sweet potatoes!

Potatoes in Andean Mountains: A variety of fascinating potatoes are grown in the Andes mountains. Many of them may be seen at the Mistura Food Festival in Peru. The Aymara are a well documented with low disease rates who thrived on over 50% of their calories derived from potatoes.

Okinawan Sweet Potato Recipes: Recipes with purple sweet potatoes, also known as 'ube'.

Tuber Recipes: A plethora of recipes with potatoes, yams and sweet potatoes, including raw sweet potatoes.

Misc Videos On Potatoes

Green light or yellow light? Potatoes are a yellow light food in Dr Greger's 3-color classification of foods. So he encourages us to eat them in moderation. Other WFPB doctors don't place such a restriction on potato consumption. Potatoes: Green Light Or Yellow Light?

Sweet Potatoes: Sweet potatoes are better than potatoes. So if possible, we should replace potatoes in our food plates by sweet potatoes! See Sweet Potatoes.

If the above transition to sweet potatoes is not possible (because sweet potatoes are not available, or out of season, or too expensive, or we don't like sweet potatoes for any reason), eating a few potatoes (like we do in regular food plates) is just fine.

Pigmented potatoes & sweet potatoes: Pigmented potatoes and sweet potatoes are better! In fact, purple potatoes and purple sweet potatoes are the best! See How To Improve The Nutritional Quality Of Potatoes?

Satiety: Potatoes are the most satiating food in WFPB food plates; they help us avoid overeating. See Are Potatotes & Sweet Potatoes Satiating?

Peeling: Potato skins are micronutrient rich. And as long as we're eating only a few potatoes, we don't have to peel them from glycoalkaloids perspective either (we should remove the green parts of potatoes and their eyes though). See Potatoes and Glycoalkaloids.

Potato Diet: If we're eating large quantities of potatoes every day, we may keep the peels for up to 1-2 lbs of potatoes and peel the rest. Who eats so many potatoes daily? Those following The Potato Diet, for example.

Even though the word 'potato' is used in The Potato Diet, it allows for sweet potatoes & yams too; it's actually a "Starch Rich Tubers Diet". If I were following the Potato Diet, I would consume sweet potatoes and yams instead of potatoes.

Cooking techniques: Boiling is better than roasting / baking. But sweet potatoes are so nutrition rich that Dr Greger recommends eating them using whatever technique we prefer. If we bake, we need not worry about the acrylamide produced in the process; see Potatoes: Is Acrylamide A Concern?

Cooling & reheating increases resistant starch and reduces glycemic index, refrigeratio. Microwaving are good ideas when it comes to potatoes and sweet potatoes. See How To Improve The Nutritional Quality Of Potatoes?

Pairing with other foods: Eating broccoli or vinegar or lemon or berries reduces the glycemic index of a potato-based preparation. See How To Improve The Nutritional Quality Of Potatoes?