Keeping carb intake under 50 g/day may or may not be a problem for you, depending on your degree of insulin-resistance. Highly insulin-resistant people need to restrict their glucose intake (i.e., carbs) to a much lower number; insulin-sensitive people can consume more carbohydrate without spiking their insulin. Serum insulin below the threshold results in ketogenesis, whereas when it is above the threshold, ketogenesis is inhibited and glucose gets stored in fat cells.
The insulin threshold is just under 25 μU/mL, and the key to keeping insulin below the threshold is to keep glucose/carbohydrate intake low.
As a matter of note, obesity is not a good indicator of insulin sensitivity or insensitivity. As of 2016 or 2017 in the U.S., there were actually more insulin-resistant thin people (called “TOFI” by doctors, “thin on the outside, fat on the inside”) than insulin-resistant fat people (about 20% of the obese are called “MHO”, “metabolically healthy obese”).
Nevertheless, if your liver enzymes are good, your inflammatory markers are low, and your HbA1C is good, then you are most likely insulin-sensitive, and a 50-g total carb intake will likely work for you.