There has been some discussion about being really low carb. Like 20 grams per day. This can cause a health problem. The brain requires glucose. Your liver can make glucose from protein but it needs fat for energy to do so and of course enough protein otherwise it uses muscle to make glucose. This formula is too complicated for you and me to get it right.
It is safe to eliminate, rice, potatoes and all grains from the diet, as fruits and vegetables supply enough glucose. Blood sugar and weight will go down. However if concerned about glucose in fruits, just eat a variety of berries. Berries are the lowest in carbs. The other thing is fruits and vegetables are where many of the vitamins, minerals and fiber comes from. We need a variety of them, If they are too limited, one could become malnourished. Constipation may set in as meat, eggs and cheese have no fiber in them. This subject is somewhat complex even for me and I know a lot about food. I know a diet free of rice, potatoes, grains and sugar is safe as I have been doing it a long time with no problem. Blood sugar will go down. If it doesn't it is likely that it is from a food that is high in carbs that you are not aware of.
With too severe a low carb diet, one can develop a problem that would be attributed to diabetes.
When it is really malnourishment. Malnourishment develops over time as the body stores some vitamins and minerals. That makes it difficult to identify. Some vitamins found in fruits like vitamin c are water soluble, your body can't store them. They must be eaten every day.
If you are older, you may attribute health problems caused by an over restricted diet to old age.
Play it safe!
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