Effect of daily consumption of whole fruit feijoa powder (Feiolix) on metabolic profile: A Randomised Controlled Trial
This randomized controlled trial demonstrates that daily supplementation with whole-fruit feijoa powder (Feiolix), particularly at a high dose of 1,150 mg, significantly improves glycemic control, insulin resistance, and lipid profiles while reducing body weight and BMI in overweight adults with prediabetes compared to placebo, without altering GLP-1 levels or causing adverse events.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of a preprint that has not been peer-reviewed. It is not medical advice. Do not make health decisions based on this content. Read full disclaimer
For millions of people, the path to type 2 diabetes begins not with a sudden illness, but with a slow, silent drift. Their bodies start to struggle with processing sugar, keeping blood glucose levels higher than normal but not yet high enough to trigger a diabetes diagnosis. This intermediate stage, known as prediabetes, is a critical warning sign. When combined with excess weight, it creates a perfect storm for metabolic imbalance, increasing the risk of heart disease and the eventual onset of full-blown diabetes. While doctors have long known that changing how we eat and move can reverse this trend, researchers are constantly searching for natural, accessible tools that might support the body's own ability to manage sugar and fat. One such avenue of inquiry involves the humble feijoa, a green, pear-shaped fruit native to South America but now widely cultivated in New Zealand. This fruit is packed with fiber and unique plant compounds that scientists suspect could help the body handle glucose more efficiently, potentially offering a dietary shield against metabolic decline.
A recent clinical trial set out to test whether a powder made from the entire feijoa fruit could actually improve these metabolic markers in humans. The study focused on adults who were overweight and already showing signs of prediabetes. Over the course of three months, researchers divided these participants into three groups. One group took a low dose of the feijoa powder, another took a much higher dose, and a third group took a placebo, which was an inert substance designed to look and taste the same but contain no active fruit. None of the participants were asked to change their usual diet or exercise habits, ensuring that any changes in their health could be attributed directly to the fruit powder itself. The goal was to see if this simple addition to their daily routine could lower blood sugar levels, improve how their bodies used insulin, and perhaps even help with weight management.
The results offered a clear signal that the feijoa powder was working. After twelve weeks, the participants who took the powder saw a meaningful drop in their hemoglobin A1c, a test that measures average blood sugar over several months. Both the low-dose and high-dose groups improved significantly compared to the placebo group, with the high-dose group showing a slightly larger reduction. This suggests that the fruit powder helped stabilize blood sugar levels over time. The benefits extended beyond sugar control. The groups taking the powder also saw improvements in their cholesterol profiles, specifically a decrease in low-density lipoprotein, often called "bad" cholesterol, and total cholesterol. In contrast, the placebo group saw their cholesterol levels rise. The high-dose group experienced an additional advantage: they lost a small but measurable amount of body weight and body mass index, while the low-dose group did not show a statistically significant change in weight compared to the placebo.
Despite these positive shifts in sugar and fat, the study found that the fruit did not work by triggering a specific hormone pathway that many modern diabetes drugs target. Researchers had hoped to see an increase in a hormone called GLP-1, which helps the body release insulin and feel full, but the levels of this hormone remained unchanged across all groups. This is a significant finding because it suggests the feijoa powder improves metabolic health through a different mechanism, perhaps by helping cells absorb sugar without needing extra insulin or by reducing inflammation, rather than by acting like a hormone booster. The study also confirmed that the powder was safe to consume, with no adverse effects on liver or kidney function reported. While the researchers noted that the study was relatively small and that the exact biological pathways still need further investigation, the evidence points to a promising natural option. For adults walking the tightrope between health and diabetes, a daily dose of whole-fruit feijoa powder appears to be a gentle, effective way to nudge their metabolism back toward balance.
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