Hi there,
Yes, we do put people on very low calorie diets (VLCD) - and they work, for a while. These diets are typically supervised by a doctor and/or a dietitian.
Whether it's starvation mode or not, I don't know, but I do know that these diets typically do not work over a long period of time (I'm talking about people who use a VLCD WITHOUT weight loss surgery). I personally think that they don't work well (for non-surgical people) because people just get tired of being hungry all the time. They get tired of not being able to eat anything. So, they stop the diet. I also think VLCD are good for immediate weight loss, but not for a lifestyle change. For example, if you need to lose 40 lbs before surgery (I worked for a clinic at one time that did not do WLS for people with BMI >60 & I used VLCD to help people get some weight off fast - to get their BMI < 60 for surgery). With all that being said, I know your question is really about Starvation Mode.
There is a lot of conflicting opinions about the Starvation Mode theory. As far as I know now, it's just a theory - not proven to be true. So, what I'm giving you is OPINION, not FACT. I think that if we are going with the starvation mode theory, that even it you do eat your 600 calories on a consistent schedule, your body would still know it's starving. And, over time, you'd still hit Starvation Mode.
What concerns me about using a VLCD for weight loss is MAINTENANCE. What would your plan be once you lose weight? Do you continue to eat a VLCD? Or do you start adding food back in? How are you going to change your lifestyle so that the weight does not come back? Would this be a long-term solution for you? This is the biggest problem with VLCD (and many diets, in my opinion) - eventually, you get tired of the diet and go back to your old ways of eating.
I don't want to discourage you from dieting -- please don't get me wrong. But, I want to ENCOURAGE you to choose a diet that you can stick with -- FOREVER. Make a true lifestyle change in your eating and exercise habits so that you not only lose weight, but keep it off --- I think this is why WLS is so popular. It helps maintain healthy habits.
I know WLS is drastic. Have you considered intense nutritional counseling with a dietitian? Along with a solid exercise routine? This could be a better way to go if you are trying to avoid WLS.
I hope more people chime in for you -- I'm sure there are others on this board that have used VLCD & may be able to give you more feedback.
Sara Nejat-Bina, RD, CNSD, CDE
Registered Dietitian