There is nothing wrong with a high protein diet as long as you choose a good protein.
Good choices:
• Soy Protein
• Beans
• Nuts
• Fish
• Skinless poultry
• Low-fat dairy products
You have to still eat your carbs though. For instance you want to cut processed carbs from your diet and choose carbs that are high in fiber. Whole grains, fruits and vegetables.
Some people argue that doing a high protein diet incorrectly can put you at risk for nutritional deficiencies which lead to bad breathe, headaches and sometimes constipation. Sometimes it can worsen kidney function as well.