Certain diets can make you feel lightheaded and nauseated. This often occurs when your body is deprived of nutrients and an adequate amount of calories over a period of time. If your weight is an issue, speak to your health-care provider about healthy ways to lose weight and the ideal weight for your body.
Anemia
If your body isn't getting enough iron from your diet, you can develop anemia. Anemia is when your body is low in red blood cells. Red blood cells carry and deliver oxygen throughout your body. When your body doesn't get enough oxygen, it can cause you to feel dizzy and lightheaded. Including more iron in your diet will usually help resolve this issue. If you have a severe deficiency, your physician may recommend iron supplements until your iron levels return to normal.
Eating Disorders
Sometimes, dieting can lead to eating disorders. An eating disorder can cause you to obsess over food and your body weight. When this happens, you typically eat too little food. Not eating enough food can be very dangerous. Those who suffer from an eating disorder tend to feel lightheaded, dizzy, nauseated and faint for a number of reasons, according to TeensHealth. Low blood sugar and poor circulation are just two of the many conditions that could lead to nausea and fainting.
Rapid Weight Loss
Rapid weight loss can cause your body to lose quite a bit of fluid in a short period of time. Most crash diets that promise and deliver fast results generally do so by ridding your body of water weight. This can cause you to feel weak, dizzy, nauseated and even lightheaded as the electrolytes within your body become unbalanced and you develop dehydration.
Limitations
A diet that limits your food intake is limiting your calories and nutrients. Some diets may allow you to eat certain types or combinations of foods, but fad diets often promote foods with little to no nutritional value. When your body doesn't have enough energy to continue throughout the day, you'll begin to feel tired, weak and even experience lightheadedness. Your stomach may begin to cramp in response to hunger, leading to nausea. It's important to include nutrient-rich foods in your diet and use portion control instead of eliminating entire food groups.
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