Yes it takes some discipline but it goes with a whole lot of knowledge and experience. If I didn't know about fasting it would have been difficult to discipline myself, even though I found out about fasting after I started experiencing the hunger. So the three of them work together.
So when I bumped into ketosis which encourages restricting of carbohydrates; I learned that after about three days you stop feeling hunger pangs and I remembered experiencing reduced hunger and increasing strengths, not too much but a kind of continual energy and not the type that gets exhausted easily.
So when I continued the study I saw how carbohydrates gives you energy (by increasing glucose) but insulin rises in your body and reduces the increased sugars in the blood which is harmful, then your energy plummets, you get tired and the hunger cycle restarts.
I talked about being a health freak in my other post so I know about nourishment of the body and other 'good diets', (most diets are good but it's the application that us usually faulty). So from my own general nutrition knowledge I see carbohydrates as foods that should be taken when the individual is about to undertake an energy sapping task that will last four a short time about 30 to 45mins. Apart from that they will just stop your body from burning fat for energy and the sugars they produce will further be stored as fats since the body will try to get them our of your blood if there is no burst of activity to utilize them.
Not to digress too much, the point is if a person doesn't eat food (or restricts carbohydrates), the first two days will be hellish, but after that the body goes to the store of fats for energy and these are plentiful and they burn slowly and your energy will be sustained all day for some days depending on how much fat your body has, making you to no longer have hunger pangs, but to sustain it for a loner time frame you'll need to be eating more fat and less carbohydrates. This is where the keto diet comes in.

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