If you only eat sweet potatoes for a month as mentioned in the question, it's hard to say whether you are fat or thin, and malnutrition is certain!
Needless to say, eating only sweet potatoes in January, it is estimated that eating only sweet potatoes for a week will drive us crazy. Although sweet potato has many nutritional advantages, its protein itself is not high quality, and the body needs high-quality protein to maintain the normal operation of the body. The fat content in sweet potatoes is indeed low, even negligible, but both our brains and the health of our bodies need fatty acids, especially essential fatty acids. This extreme behavior of eating only sweet potatoes is hard to say whether you can lose weight in a month, but if you want to eat yourself out of malnutrition, it is difficult to defecate (too much dietary fiber intake can also cause constipation) or not.
If you want to lose weight, don't "snap" yourself. The real way to lose weight is to "shut up and take your legs"!
In fact, the tricks to lose weight are really endless, and many wonderful ones simply fall below the three views. For example, the sweet potato in question can be thin after eating for a month! Eat sweet potatoes when you are hungry for a month, and eat nothing else. It's really hard to say whether you are fat or thin after eating sweet potatoes until you are full. Sweet potatoes also have calories.
If you want to lose weight, you need to control the overall calories, keep your mouth shut and take your legs. It is the most important thing to develop good living habits through losing weight. No matter how good things are, it is not reliable to eat only or eat more.
To sum up, friends who want to eat sweet potatoes for a month to lose weight, don't be ridiculous! It's hard to say whether you are thin or not, but it's true that your health is really uncomfortable before you eat sweet potatoes for a few days!