• Moh Shuying

We Tried The Prolon Fast So You Don’t Have To

The popular meal replacement programme loved by celebrities and socialites is said to be an easy and tasty way to lose weight and get healthy.

Horst P. Horst; 'A woman sitting at a dining table', 1948

Dulu paid for our own ProLon 5-Day Programme.


What it is: The ProLon Fasting Mimicking Diet is a 5-day dietary programme that gives the benefits of a fast whist still giving you nutrition to help fight hunger and protect your lean body mass. Based on research from Valter Longo, PhD and the University of Southern California’s Longevity Institute, the diet is a type of intermittent fasting and is supposed to provide you with about half of your regular calorie intake. You get about 1,150 calories on Day 1, and approximately 800 calories each day for the rest of the programme.


The calorie restriction is meant to trigger physiological responses such as cellular rejuvenation, lower inflammation and loss of fat; all which are associated with ageing and age-related diseases. A clinical study revealed that participants who completed a 5-day ProLon cycle once a month for three months lost an average of 5 pounds (2.26 kg) and 1.6 inches (4 cm) off their waist circumference.


Ingredients: The food is made of over 73, primarily plant-based ingredients and does not contain additives, preservatives or chemicals, although the ProLon energy drink does contain the natural preservative polylysine.



Packaging: This is probably our favourite thing of the Prolon Fast. The meals come in five small boxes (one for each day) that include neatly arranged energy bars, soups, a variety of snacks, drinks, and supplements. Everything is clearly and carefully labelled, and comes with a meal card that tells you what you should eat for breakfast, lunch, afternoon and dinner, which makes it really easy to follow.

Taste: As meal replacements go, it’s definitely not the best we've tasted (juice fasts are yummier) but it’s also not the worst. What we like about it is the variety of items. It includes different soups, snacks and teas. The soups are made from powder and can taste a bit synthetic after a few days. Our favourite item of the programme is definitely the L-Bar Choco Crisp. It was sweet and almost rich-tasting when compared to the rest of the rather blend items.

The Verdict: Like many meal replacements, the Prolon Fast is quite pricey. At about S$350 for the entire programme, you’re paying $70 a day. Day 1 and 2 went by quite quickly, but by Day 3, we were feeling really hungry.


Okay, confession time. We did the fast during Circuit Breaker, where our daily joy came from ordering takeout. Because of that, we broke the fast on Day 4 by adding in a sandwich. And on Day 5, we ate a mixture of regular food and the programme’s nutrition bars. Despite only following the program strictly for three days, we did manage to lose about 1.6 kg by the end of the fast. We didn't however, feel any difference in our energy levels. Would we do it again? Probably not.

Our Score: 3.5/5


This article is intended for informational purposes only. It is not a substitute for professional medical advice, diagnosis or treatment.