Atkins Criticism: What Critics Say and What the Research Shows
The Atkins diet has always attracted strong opinions. The old version of this post defended it against its critics, using claims such as “thousands of testimonials” and “easy to follow for long periods.” Testimonials are not evidence, so this rewrite looks at the main criticisms one by one and checks each against research. The aim is not to attack or defend the diet, but to give you an accurate picture before you decide.
Is it too high in fat?
This is the oldest criticism. Atkins says its plan includes a balance of monounsaturated, polyunsaturated and saturated fats and that manufactured trans fats should be avoided. The old post emphasized olive oil and other helpful fats. Heart-health guidance is more cautious about saturated fat: MedlinePlus describes the Therapeutic Lifestyle Changes diet, which advises getting less than 7 percent of daily calories from saturated fat. A low-carb plan built on butter, cream and fatty meat would exceed that limit easily, so if you follow Atkins, it makes sense to choose fish, poultry, nuts, olive oil and vegetables for most of your fat and to ask your doctor about your cholesterol.
Does Atkins ignore exercise?
The old post replied that the Atkins books clearly spell out a need for exercise, and the Atkins site does say that being active is important. So this criticism is weaker than it is often made out to be. The Physical Activity Guidelines for Americans say adults need 150 to 300 minutes of moderate activity a week whatever diet they follow, and our post on everyday activities that count as moderate exercise shows how to fit that in.
Is it hard to keep up for the long term?
Critics say it works for a while and is then hard to stay on. The old post said people who succeed with it find it easy. The research is mixed. In the 2018 DIETFITS trial of 609 adults, those on a healthy low-carb diet lost 6.0 kg after 12 months, compared with 5.3 kg on a healthy low-fat diet, and the 0.7 kg difference was not statistically significant. Both groups were coached for a year, and about one in five people did not finish the trial. Seen from this angle, the diet worked about as well as a good low-fat diet, no better and no worse. Whether you can sustain it depends on whether you like the foods. For people with type 2 diabetes, an American Diabetes Association consensus report found that the blood sugar benefits of very low-carb diets were clearer at 3 and 6 months than at 12 and 24 months.
What about the side effects?
The old post said constipation and bad breath are less common than critics claim and usually last only through the first phase, and that drinking more water helps. Part of that is right. Cleveland Clinic says that “keto flu” symptoms, which include irritability, nausea and constipation or diarrhea, can appear two to seven days after you reach ketosis and usually last one to two weeks, though they can last as long as a month. If the problem persists, speak to your doctor. Eating enough fiber from vegetables, nuts and seeds, and drinking plenty of fluids, often helps, and our guide to Atkins and intestinal problems has more tips.
Who should be careful?
Some people should not follow a very low-carb plan without medical supervision. The American Diabetes Association’s 2019 consensus report says more research is needed in people with chronic kidney disease, disordered eating patterns and women who are pregnant. Its Standards of Care add that low-carb plans are not recommended for women who are pregnant or lactating, people with or at risk for disordered eating, or people with kidney disease, and should be used with caution with a class of diabetes drugs called SGLT2 inhibitors because of the risk of ketoacidosis. If you take medicine for diabetes or blood pressure, the dose may need to change. Always check with your doctor first.
So who is Atkins right for?
The old post concluded that if you do not enjoy preparing and eating meat, Atkins is probably not for you. That overlooks the fact that vegetarian versions exist, but the point stands: the best diet is the one you can follow safely for a long time. Look beyond both the hype and the criticism. If you decide to try it, read the Atkins diet basics, avoid the common mistakes Atkins dieters make, and see the 2018 trial for yourself: DIETFITS trial.