keto is asking for heart disease and other problems (because of the typically high-meat consumption), but other than they just do not eat carbs whatsoever.
If you're on keto, especailly at your weight, carbs will cause HUGE blood-sugar spikes, even if they're starches.

That's why I personally went on a high-carb low fat diet (opposite of keto basically), lost down to 160~ lbs no trouble. Just ate as many baked potatoes, fruits, meusli, etc, and even gourging myself and eating till I was stuffed I lost weight.