Have you already tried eating better (Click to follow link)?
If not, you probably don’t need to try something as restrictive as the Keto diet in order to achieve the results you’re seeking.
If you have, but your results aren’t what you’d like, try carefully tracking your portions for a few days using a nutrition tracker like My Fitness Pal. You can compare this information to a calculation of how many calories you're likely to need (I personally think this calculator from Precision Nutrition is pretty useful). If you are eating more than 200 calories per day too much or too little, you may want to consider adjusting how much you eat every day before trying Keto.
If you’re already eating better, and you’re eating the right amount, it could potentially be worth trying Keto, especially if your doctor has told you you have high or borderline high blood sugar. As with any health consideration, discuss this with your doctor.
A healthy body should effectively process fat, carbs, and protein as fuel. Sometimes, however, particularly in America where sugar-laden drinks, pastries, sauces and even “health foods” are everywhere, people can get dependent on carbs as a source of fuel, and the body becomes less able to process fat as fuel. In this case, a Keto reset (a 30 to 90 day period of high fat, moderate protein, and very low carb intake) could potentially help the body to adjust to using fat as a fuel source and restore metabolic flexibility.
One caveat is that some people are genetically predisposed to process saturated fat inefficiently. For these people, a Keto diet would probably not be very effective as fats consumed would be stored as fat rather than converted to energy.
If you have normal blood sugar, a Keto diet (or just a relatively high fat diet, above 40% of daily calories) may still be a productive eating pattern, particularly if processed carbs are a large part of your current routine. In this case, through avoiding carbs, Keto may introduce a caloric deficit which would contribute to weight loss. That said, if optimal sports performance is among your top priorities, be aware that reducing your carbohydrate intake could result in lesser stamina, especially in the early phase before your body adjusts.
A final note on Keto. As with any nutrition program, there are ways to follow the Keto rules which may work for weight loss in the short term, but are unlikely to promote health in the long term. Still choose foods which are minimally processed without chemical additives, meats which are high quality, vegetables that contain fiber, and a variety of plant-based fats. Nacho cheese and hot dogs, while consistent with Keto macros, are not likely to promote optimal health.