We are very sorry to hear that you have not had success on the program.
Some thoughts below;
It can take a little time for the body to adjust to changes in dietary habits and we do tend to have fluctuations in weight during the short term as you noticed with your previous diet.
When we alter our diet there may be changes in regularity which may take a while for the body to readjust. We therefore hold onto this weight and it shows on the scales. Eating more fibre-rich foods and drinking more fluids can help the body to normalise again.
If you were already restricting your food intake before starting the program then it may well take a little longer to see an effect, and it is possible that if you were eating very minimal calories already then the FAST Start may in fact be providing more calories in comparison which will of course lead to weight gain.
The FAST shakes are meal replacements and are only designed to be used in place of a meal (not to be used as snacks), they are different to the previous BT protein shakes and if you were to have the FAST shakes as snack options then this would very likely lead to weight gain.
Ultimately healthy, sustainable and meaningful weight loss does take time. In general we have had great feedback on this program, but what works for one person may not work for the next as there are a lot of variables to consider. It may well be the case that your previous diet suited you better, it does sound like a good and well- balanced approach.
The shakes have just less than 9g of fat per serve which is coming from the milk powder ingredients. A certain amount of fat is essential in our diets and it also helps to provide satiety.
We will have someone contact you shortly.