A systematic review of 26 short-term intervention trials (varying from 4-12 weeks) evaluated the appetites of overweight and obese individuals on either a very low calorie (~800 calories daily) or ketogenic diet (no calorie restriction but ≤50 gm carbohydrate daily) using a standardized and validated appetite scale. None of the studies compared the two diets with each other; rather, the participants’ appetites were compared at baseline before starting the diet and at the end. Despite losing a significant amount of weight on both diets, participants reported less hunger and a reduced desire to eat compared with baseline measures. The authors noted the lack of increased hunger despite extreme restrictions of both diets, which they theorized were due to changes in appetite hormones such as ghrelin and leptin, ketone bodies, and increased fat and protein intakes. The authors suggested further studies exploring a threshold of ketone levels needed to suppress appetite; in other words, can a higher amount of carbohydrate be eaten with a milder level of ketosis that might still produce a satiating effect? This could allow inclusion of healthful higher carbohydrate foods like whole grains, legumes, and fruit. 
I give you points for not completely bashing the Keto diet but I have to ask you why do you think it is hard to follow? Do you tell vegans that their diet in unsustainable? I know for myself I can go to almost any restaurant and eat a keto meal the same could not be said with vegans. A properly balanced keto diet would require no vitamins or minerals (the reason for Keto “Flu”) the same can not be said for vegans, most vegans have major deficiencies and some vitamins like B12 are near impossible to obtain without supplements.
What carbs should I avoid
Once the medical community acknowledged the keto diet’s effectiveness in reducing seizure episodes, they decided to look further and study its impact on neurological diseases in general. Neurological diseases share a common problem – a deficiency in energy production. Ketones provide that energy for normal brain cell metabolism, and may even be a more efficient when the body is in starvation mode. When patients were put on the keto diet, the number of mitochondria (energy powerhouse) in brain cells increased. Ketones may also act as an antioxidant by inhibiting the formation of reactive oxidant species, which is why they may have promising effects in the treatment of certain cancers in conjunction with chemotherapy.