FROM DATA TO PRACTICE: YOUR COMPASS IN FASTING – APRIL 2026
A seasonal look at the science of fasting
Each season, we review newly published studies in leading scientific journals. Some confirm what we already observe in clinical practice. Others challenge us with simplified narratives that deserve a more critical reading.
This is particularly true for a recent Cochrane review (“Intermittent fasting for adults with overweight or obesity”) which concluded that intermittent fasting for obese persons is not superior to conventional dieting for weight loss or even to no intervention at all. Unsurprisingly, this sparked bold headlines across newspapers and websites.However, as is often the case in science, the reality is more nuanced.
Intermittent fasting as a return to the circadian rhythm
When properly practiced, is an essentially advisable return to our physiological circadian rhythm: It consists, during 24 hours, in stopping absorbing food or caloric beverages – typically during10 to 16 hours overnight and eat during the remaining interval of 8 to 14 hours during daytime.
The daily Fasting interval Is Not One-Size-Fits-All
If the right interval of fast for a given subject is adapted individually, intermittent fasting:
- Restores natural hunger signals
- Enhances satiety awareness
- Supports digestive power recovery
- Contributes to a stable normal body weight
The secret lies in flexibility. A late, heavy dinner at 11 p.m. may require a longer fasting period (14–16 hours) to restore genuine hunger and digestive readiness around lunch time. In the contrary, a light dinner at 6 pm might allow the regeneration of the hunger feeeling around 9-10am.
Looking Beyond the Headlines
In the Cochrane review nearly 18,000 abstracts were screened and only a small number of trials were ultimately included. These studies applied highly heterogeneous fasting strategies – such as alternate-day fasting (eating one day, consuming only water the next), a method rarely used in real-life clinical settings.The duration of these studies ranged from just a few weeks to several months.
Even the authors – and many independent experts – expressed moderate confidence in the conclusions, not only regarding body weight but also other health outcomes.
In short: the evidence is limited, variable, and far from definitive.
Eating Quality Matters
The studies analyzed individuals with obesity and examined when and how long they fasted, but not what they ate during the eating interval. This is a crucial omission. Thus, for individuals with obesity – often characterized by disrupted eating patterns and diets rich in refined sugars and cheap unhealthy fats—fasting every day some hours during night time alone is not enough. If the eating window becomes an opportunity for continued poor nutrition and for overcompensation, weight loss is unlikely.
What Does This Mean for You?
It is essential to distinguish between intermittent fasting of some hour every day over night and Buchinger therapeutic fasting of some days or weeks. In contrast, prolonged Buchinger fasting (5–21 days or more), conducted under medical supervision, leads to significant weight and fat loss. More importantly, the effects go beyond weight reduction – they involve deep metabolic shifts. This has been consistently documented in clinical studies, including our own research.
Fasting and Type 2 Diabetes
A recent long-term randomized trial in individuals with type 2 diabetes reported that cyclical five-day “fasting” phases over three months led to sustained remission in a large proportion of participants—even three years later. In that case it was not fasting but calorie, sugar and protein reduced meals. This finding supports what we observe clinically: structured fasting can trigger durable metabolic adaptations, not just temporary weight loss.
“Fasting Mimetics”: Science or Shortcut?
Another study caught our attention and raised some eyebrows. The concept of “fasting mimetics” has resurfaced. A supplement combining spermidine and other compounds showed improvements in hunger control and several cardiometabolic markers over eight weeks. But calling this a true substitute for fasting is, at best, an overstatement. Fasting is not a single mechanism. It is a coordinated systemic multidimensional program, involving:
- Hormonal regulation
- Metabolic switching
- Cellular repair processes
Beyond the physical, fasting also has:
- A social dimension (shared group experience and solidarity)
- A psychological and even spiritual dimension (clarity, reduced anxiety)
It is highly unlikely that a capsule can replicate this complexity. Improvements in isolated biomarkers should not be confused with the full metabolic transition into a fasting state. Such claims often lean more toward marketing than science.
From Science to Practice: Supporting You Beyond the Clinic
Science continues to evolve and so does our approach to fasting. To support the long-term metabolic benefits initiated during your stay, we are introducing a new follow-up programme. The “FastForward Programme” is designed to accompany you after returning home in your everyday life. That includes:
- Guided intermittent fasting
- Behavioural modification through self-observation
- Continuous glucose monitoring
- Short 5-day fasting cycles at home (“The Buchinger Fasting Box”)
- Regular video consultations with Buchinger physicians and nutritionists
This programme bridges the gap between clinical experience and daily life—helping you sustain the benefits of fasting over time.
