__If you experience problems with your cardiovascular system,__ you should not try extreme low-fat diets. This leads to a decrease in the level of "good" [cholesterol](https://ul.orna.me/KOge/librarybiomarker?id=57), which protects blood vessels from [atherosclerosis](https://ul.orna.me/KOge/librarydisease?id=112) and creates a significant deficiency of fatty acids necessary for the absorption of vitamins [A](https://ul.orna.me/KOge/librarybiomarker?id=85), [D](https://ul.orna.me/KOge/librarybiomarker?id=187), [E](https://ul.orna.me/KOge/librarybiomarker?id=66), and [K](https://ul.orna.me/KOge/librarybiomarker?id=493). __Low-carbohydrate diets (Keto, Paleo, Atkins),__ in turn, create the opposite effect. Cutting back on the number of carbohydrates your intake leads to the consumption of more fatty foods, which can increase the level of "bad" cholesterol. This can cause metabolic disorders and the development of atherosclerosis and coronary heart disease. Are you ready to take the risk? Get a cardiogram and visit a cardiologist and inform them of your intentions. They may advise you to take additional tests before making a decision. __Protein diets,__ popular today, are especially unhealthy for the [kidneys](https://ul.orna.me/KOge/librarydisease?id=75), intestines, and cardiovascular system. These diets can aggravate any conditions that affect these organs. To check if a diet like this will help you, get a urine test and do an ultrasound of the kidneys. Visiting a gastroenterologist and listening to their recommendations is also a good idea. __Plant-based diets can be harmful by causing a nutritional imbalance.__ The imbalance primarily affects the health of the hematopoietic system, immune system, and the condition of the bones and joints. A plant-based diet can’t be recommended for people with [anemia](https://ul.orna.me/KOge/librarydisease?id=1), frequent [viral](https://ul.orna.me/KOge/librarydisease?id=32) and bacterial diseases, or problems of the musculoskeletal system. Before exploring this type of diet, it’s worth taking a Complete Blood Count (CBC), checking the levels of [iron](https://ul.orna.me/KOge/librarybiomarker?id=140), [ferritin](https://ul.orna.me/KOge/librarybiomarker?id=88), and [vitamin B12](https://ul.orna.me/KOge/librarybiomarker?id=215), passing a check for immunity, and checking bone density. Bone density can be determined by testing [calcium](https://ul.orna.me/KOge/librarybiomarker?id=127) levels, [vitamin D](https://ul.orna.me/KOge/librarybiomarker?id=187) levels, and taking a bone densitometry test. __[Intermittent fasting](#https://ul.orna.me/KOge/community?discussion=16076 "Intermittent fasting")__ increases the risk of developing [gallstone](https://ul.orna.me/KOge/librarydisease?id=69) disease due to the stagnation of bile in the body during long breaks in food intake. Before pursuing this eating style, you should check the condition of the gallbladder and perform an ultrasound of the area. People with a hereditary history of [gallbladder disease](https://ul.orna.me/KOge/librarydisease?id=76) should not do intermittent fasting.