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You will feel extremely tired, and void of energy. You will have trouble with any physical activity, your concentration will be hindered, and you may experience some dizziness. It depends largely on substitutions. A diet of carbohydrates will produce all of these effects and more, whereas a diet of fruit and vegetables will only leave you somewhat fatiqued.
There are several different symptoms you may experience if you are lacking protein. Some of these symptoms include a constant craving for carbs, sweets, caffeine, and chocolate. You may also have joint pain, lack of sleep, and low energy levels.
The body uses proteins from foods to break down into amino acids, for protein synthesis (the process of creating proteins within cells.).
As a result a lack of proteins in the diet will cause an inability to produce the body's own required proteins which will lead to slower growth and repair of cells (and assuming your question is referring to multi-celled organisms) a lack of overall health (disease / infection) due to a lower number of white blood cells being produced.
Note that for most people who are eating enough calories to maintain body weight, protein deficiency is nearly impossible, unless you are consuming the bulk of your daily calories via "empty" calories, like refined sugar, refined fat, or alcohol. If you are not getting enough protein because you are not getting enough food, that is called starvation, also known as kwashiorkor. The symptoms of kwashiorkor include:
The symptoms of protein deficiency could be
If you don't get enough protein, your body has less energy than a person who does get enough protein.
If you don't have enough protein, it will be harder for muscles to repair after activity, and harder to heal bad injuries.