Will metabolism slow down on a very low calorie diet?

Yes. If your body does not get enough calories, it sends stress signals to the brain. These stress hormones try and preserve the body by decreasing energy used and in doing so slows the body's metabolism.
Most likely. On a very low calorie diet the metabolism will most likely slow down unless you're getting most of your calories from protein or very complex carbohydrates. In general weight-loss causes the metabolism to go down because the body has to run a smaller weight. If you're trying to increase your metabolism go on a little car ketogenic diet for most of your calories come from lean protein and some bastable's and a little bit of fruits as well as healthy fats like planned or fish-based fat.

Related Questions

Can a low calorie diet can slow down weight loss?

No. A low-calorie diet speeds up weight loss. If a person eats fewer calories than he needs to live on each day, his body will use the stored fuel (fat). If a person exercises more than he did before, but does not start eating more calories, then his body will also use up the stored fat. The only way a low calorie diet can possibly slow weight loss is if it somehow stopped a person from exercising. Read more...
Low calorie diet. Low calorie diets are 800-1000cal/day with small meals every 2-3 hours r very effective. People consuming fewer than this may decrease their resting metabolism rate over time since too few calories appears like starvation, causing the body to slow its metabolism rate. Weight loss centers measure resting metabolism rate to help develop a program right for your metabolism & monitor muscle loss. Read more...