An excellent site on a subject of a healthy nutrition is:
I certainly would not encourage anyone to purchase any commercial "diet" products or commercially advertised supplements.
No doubts, there are natural products and supplements which do have beneficial and/or therapeutic effects. I strongly advice to use an independent and commercial free source, such as www.consumerlab.com as a guidance.
For those who are looking for further scientific analysis of dieting and nutrition, please go to...
Please, give a strong consideration to buy this produce organic (to avoid products otherwise highly contaminated with pesticides):
Sweet bell pepper Lettuce
Strawberries Domestic Blueberries
Imported Nectarines Potatoes
Green beans Kale