Diet World
Verified listingAbout Diet World
What is Diet World?
Diet World is a weight loss clinic at 4844 N First St #101 in Fresno, California. The phone number is (559) 224-6744. It has been open since 1999, and it has a 4.1 rating from 24 Google reviews. It is open Monday through Friday, 9 AM to 5 PM, and closed on weekends.
Weight loss is the whole practice. Its four services are nutritional counseling, appetite suppressants, injectables and supplements. The program includes a consultation and weekly weigh-ins, with the plan adjusted at each visit.
Dr. Gregory Williams is the one prescriber the clinic names. It describes him as a family medicine physician with over a decade of experience in primary care, nutrition and obesity medicine. It names phentermine and diethylpropion among its appetite suppressants, and HCG among its injectables. In its own words: "Select from prescription medications designed to manage weight."
What does it cost?
It does not publish prices. There is no consultation fee, no program price and no monthly figure, and it does not say whether medication is included in any program. It also does not say whether it accepts insurance, or whether HSA funds or financing are an option. Ask for every number in writing before you book: the consultation, the monthly program, each prescription, each injection, each supplement you are considering, and follow-up visits. Ask whether anything is billed separately from the program fee.
What should you ask before you book?
Start with the prescriber. Ask whether Dr. Williams writes each prescription and whether he examines you before one is issued. Ask whether the phentermine, diethylpropion or HCG would be brand-name or compounded, and who supplies it. Ask whether a GLP-1 medication is offered, since none is named. Ask whether the monthly fee covers medication or whether each fill is billed separately. Ask what weekly weigh-ins, follow-up visits and any lab work cost, and whether telehealth is available, since the clinic does not say. Last, ask how to cancel, whether there is a minimum term, and what happens to visits you have paid for in advance.
Who is it a good fit for?
This is a good fit if you want a weight loss clinic with a physician named on its program, you can book weekday visits in Fresno, and you are ready to pay out of pocket once you have the prices in writing. It may not suit you if you need weekend appointments, or if you want a clinic that publishes its fees and medication policy before you commit.
Sources: fresnodietworld.com, fresnodietworld.com/services, fresnodietworld.com/about-us
Services Offered
What we confirmed
Read off Diet World’s own website on 2026-10-13. These are their words, not ours.
- ✓Medical weight loss — listed on their site as “Prescription appetite suppressants like Phentermine and Diethylpropion are effective for chronic weight management.” source
We have not yet collected published prices or prescriber credentials for this clinic. When we do, they will appear here with a link to the page they came from — or a note saying the clinic publishes none, which is itself worth knowing. Call them for a price in the meantime.
Hours
Monday – Friday: 9 AM – 5 PM Saturday – Sunday: Closed