How konnyaku made is, potato grated to powder, and then mixed with boiled water. It gets sticky and you mix it with hands. Mix with lime water, pour it in the pat, leave it and it becomes firm. Then boil in the water for 30-40min to finish.
Those Konnyaku blocks have got almost no Kcal. ( 21kcal for 250-300g konnyaku block, 180-200g shirataki is 11Kcal) The nutrition is almost water but it makes your appetite full, that is why it is suitable for diet food. As shirataki is shaped like noodles, you can easily use them for your diet noodle menu!
Also, Shirataki contains Glucomannan, it is considered a dietary fibre. It absorbs water in the stomach, and that is why it makes you feel full. Glucomannan also works to relieve constipation, reduce cholesterol in the blood and blood sugar level.
All you need to do is to change noodles to shirataki noodles to your noodle dishes. It is called Zen pasta in Italy. You can cook ramen to spaghetti with shirataki noodles!