Harvie, M. N., Pegington, M., Mattson, M. P., Frystyk, J., Dillon, B., Evans, G., … Howell, A. (2011, May). The effects of intermittent or continuous energy restriction on weight loss and metabolic disease risk markers: A randomized trial in young overweight women. International Journal of Obesity (London), 35(5), 714–727. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3017674/

The researchers explain that people who cook their own meals may simply have other good-for-you habits, like exercising more. However, they also concluded that home cooks ate more fruits and vegetables (along with a wider variety of foods), have healthier methods of prepping their food, and splurge less on foods high in calories and sugar. Consider any of the healthy eating books below to get started.
I am on day four and I am very discouraged. I don't feel as if I am losing any weight at all. I encourage you to complete the seven days. Don't be too disappointed if you don't lose all ten pounds. Everybody and metabolism is different. Do be careful, however, to follow the diet exactly. Don't eat less food than is recommended in your effort to lose weight as that will throw off the diet's chemistry.