Hey there! Freshman (well technically sophomore) nutrition major here, but I've only taken two nutrition-related classes so I'm by no means an expert! xD
Against Keto Diets
Diets that bring about ketosis for weight loss are highly scrutinized in the nutrition science world. So basically all your scholarly, peer-reviewed journal peeps frown on it, as do the textbook writers, clinical dietitians, and the like. Right now, they are all touting the balanced diet, a mix of your fruits, veggies, whole grains, fats (preferably the majority of which should be polyunsaturated or monounsaturated), lean meats, nuts, lentils, etc., etc. Keto diets, according to these people, are too high in saturated fats, and too low in fiber (from your whole grains and fruits), and they believe that they raise LDL cholesterol. Additionally, the initial weight loss seen from keto diets is actually not fat, but from the water your body uses to store (I believe it's called glycogen) its carb reserves. Also, carbs are touted by the nutrition scientists to be the best fuel for exercise.
For Keto Diets
The book Good Calories Bad Calories by Gary Taubes makes a compelling case for the keto diet. According to this book, the composition of fat found in meats is less than 50% saturated fat, and then the rest is composed of I think polyunsaturated and monounsaturated fats. The saturated fat will raise both LDL and HDL cholesterol, and the unsaturated fats will lower the LDL cholesterol, which results in a net gain of HDL and a loss of LDL. The keto diet is excellent for weight loss, according to him, as he states that insulin levels are responsible for obesity, and the keto diet manages insulin levels by limiting carbs. For his evidence of high insulin supporting obesity, he cites diebetics, studies performed on rodents, and a handful of human examples. However, this book makes zero use of double-blind studies which are the hallmark of good science, cites personal testimonies, and uses a few rare and odd examples such as a woman who got a burn on her hand, had skin transferred to her hand from her abdomen, and then that spot on her hand got really fat. I forgot what point he was making with that, but using examples such as this one to support your statements is bad science. Also, this book makes very good points about how saturated fats came to be condemned. Gary Taubes states that the saturated fat hypothesis originated from a man named Ansel Keys who studied 7 different countries and their diets to come up with the hypothesis that saturated fats cause heart disease. However, Keys is thought to have picked countries to support his hypothesis, such as saying, "hey look at this nation who eats lots of fiber and unsaturated fats! They have good health! And this country over here who eats lots of butter has bad heart health!" and then ignored the countries who ate lots of meat and had good heart health and the countries who didn't eat lots of meat and still had bad heart health. The American Heart Association was at first very much against Keys and his hypothesis but eventually swung over to his side due to the board members who wanted to at least do something about the obesity crisis, instead of just telling people that they didn't know what to do.
A couple other books that talk about saturated fat ...
The Gap Psychology Diet and Nutrition Essentials for Mental Health both talk about how saturated fats are wrongly condemned. Neither books however, talk about keto diets, and the Nutrition Essentials for Mental Health talks about gluten and casein contributing to mental disorders WHICH IS SO VERY VERY WRONG (I can give you evidence for this if you want).
Long story short, I would definitely recommend you do a lot more research before embarking on this keto diet. For weight loss, the recommended steps are to first talk to your doctor about it, and then follow through with talking to a dietitian if your doctor recommends it. Choose a diet plan that you can stick to for the long-term. Only 5% of dieters manage to maintain their weight loss for more than a five-year period because they view their lifestyle changes as only short-term. YOu need to be making lifestyle choices that will last you the rest of your life. Be wary of fad diets (like the keto diet) that promise fast and easy results. Only choose the keto diet if you really think you want to maintain these lifestyle choices for the long-term, otherwise you could end up weight cycling which is worse for you than just staying the same weight (its a heart-disease risk and when you gain back the weight a lot of it will settle around your abdomen). Lastly, it's recommended to lose no more than 2 pounds a week.
A few more quick points:
1. Experts have been wrong before about nutrition-related info (and lots of other things). For example, bananas were once touted as the cure for celiac disease (dietetics history is funny).
2. And I forgot the rest of the points I was going to make ... I might come back later if I remember.