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OPTIFAST Weight Loss Program in York Region

OPTIFAST Program is a medical weight loss program that closely monitor and assesses progress towards a better heath and emotional well-being. The advantage of the Program is that you are provided with a high-quality, calorie-controlled, nutritional plan that transitions to self-prepared every day meals while being supported by our multidisciplinary team. Unlike other meal replacement, the OPTIFAST program treats you as a whole person and not just your weight. Unlike fad diets, the OPTIFAST program has been proven effective in more than 80 clinical studies. More than 1 million people have participated in the program since 1974. To learn more about the positive results yielded by clinical studies on comprehensive weight management programs, visit the OPTIFAST website. The OPTIFAST program has been designed for people who have a body mass index (BMI)that is greater than 30 kg/m2. The program utilizes medical, nutrition and behavioral elements to achieve lasting weight loss.


Average Weight Loss in 26 weeks

30 lbs

OPTIFAST® patients who actively participated in a 26-week medically-monitored program typically lost approximately 30 lbs.

Higher weight loss

2x More

Compared to a reduced-calorie food-based* program

Average loss of total fat mass

11.3 kgs

Compared to a 4.4 kg loss observed in individuals in a reduced-calorie food-based program*

Decrease in waist circumference

12 cm

Compared to a 7.7 cm decreased observed in reduced-calorie food-based program*

Blood glucose levels


Weight loss with the OPTIFAST® program can help lower blood glucose vs baseline 2,3

Average decrease in blood pressure


Weight loss with the OPTIFAST®program can help manage hypertension2,4

Average decrease in total cholesterol


Weight loss with the OPTIFAST® program can help manage cholesterol levels2,4 * modified version of Diabetes Prevention Program (DPP)


OPTIWIN is a year-long study, designated to evaluate the effectiveness of the OPTIFAST® weight loss program, in comparison with a standard-of-care, reduced energy, food-base diet (modified version of Diabetes Prevention Program, DPP) and lifestyle intervention among adults with a BMI higher than 30.

Study Design


52 weeks: 26-week weight loss phase, followed by a 26-week weight maintenance phase.


Open-label, randomized, controlled trial


multicenter (9 sites across the U.S.)


330 eligible for study; 273 in the mITT* study population




Conventional food, encouraged 1-2 meal replacements per day.


(n-=138 mITT*)


Reduced energy (-500 to -750 kcal/day, 25% to 30% fat) diet based on *modified Diabetes Prevention Program for 26 weeks.


Increased energy intake to achieve weight maintenance.


150-180 minutes per week of moderate to vigorous intensity exercise Group (weekly) and individual (per schedule) behavioral counseling sessions

Results Mean weight loss (%) Patients lost approximately 2x as much weight using the OPTIFAST® program


Mean change in total fat mass (kg)

OPTIFAST® program patients achieved greatest reductions in total fat mass


Mean change in waist circumference (cm)

Patients experienced greater reductions in waist circumference using the OPTIFAST® program

optifast steps optifast

Step 1: Calculate your BMI. OPTIFAST is designed for those with a BMI of greater than 30.

Step 2: Make an appointment to come and speak to our team about the OPTIFAST program.

Step 3: Determine if you will complete the partial or full program

Step 4: Get started.