People who should NOT eat QOD

• If you have a tendency to binge eating.
  Any diet can precipitate an eating disorder. Eating freely on the “ON” days can be abused, and can lead to a pattern of binge eating. This is very dangerous to your health.
• If you have diabetes and are on insulin or other medication for this.
  Your diabetes meds assume a constant, daily intake of calories and sugars. Eating QOD is not for you unless you want to try this under your doctor’s supervision.
• If you have high blood pressure and are on diuretics (water pills)
  During the off day you tend to lose water because ketosis can make you urinate more, and your sodium intake is shifting a bit, despite efforts to keep it constant. This may make it tough to control fluid balance in someone needing water pills.
  
• If you have low blood pressure or have had a history of a stroke or near-stroke, you should not be eating QOD.
• If you are “salt-sensitive” - Some people with high blood pressure are made worse by increased salt intake. People with chronic kidney disease are also sensitive to salt. You should be eating mostly low-salt foods on your “ON” day, but the daily intake may be increased slightly on the “ON” day. This may be too much salt for some people (U.S. average is 4g/day in men and 3g/day in women).
• If you are taking medication of any kind or have any serious medical condition requiring medical attention. The absorption of many medications is affected by food. Eating QOD might change the absorption of medicines you are taking. In such cases, consult with your doctor before eating QOD.
• People with serious medical conditions such as heart, kidney, or liver disease, should also not try to eat QOD unless under direct supervision by their doctor. Large meals make the heart pump more blood, and while still unproven, some studies suggest that the risk of heart attacks may be markedly increased soon after eating a large meal. During your "ON" day your caloric intake should be very similar to your normal maintenance caloric amount, but the tendency may still be to eat larger meals. If you have had a heart attack or are at increased risk for a heart attack, QOD eating is not for you.
• If you need to restrict your potassium or sodium intake for any reason.
• Do not eat QOD if you are not overweight. The QOD as presently configured is a weight loss diet and not a lifestyle diet. The risk of any weight loss diet is that you may lose muscle mass over time, especially if you gain back your weight, go back on the diet, and keep going back and forth. Lowering your muscle mass will lower your metabolic rate and is not healthy.
• Do not eat QOD if you are pregnant or trying or intending to get pregnant in the near future.
• The QOD diet is designed for people who are basically healthy, but overweight, 20-60 years of age, and who have 25 lbs. or less of weight to lose. It is not meant for teenagers, nor for the elderly, nor for those who are massively obese.
• For more information, please read this disclaimer here.