|I certainly recommend eating fish. Whether I will be recommending fish hydrolysate supplements in the future, however, will have to be determined when additional studies with different baseline diets will have been published.|
Unlike the product that was used may suggest, the study was not sponsored by the supplement company. The authors received neither funding nor other external support and they also declare that they don't have a conflict of interest that may be related to patents or direct involvements in the industry. I guess it's important to point that out, even though fact that the scientists chose whey, i.e. an actually relevant control, instead of carbohydrates or just plain water, may have given away the lack of sponsorship, anyways.
Two weeks before the study started, subjects were asked to fill in an alimentary diary reporting their food preferences. A mild hypocaloric ( 300 kcal/day) diet was elaborated for each subject by a dietitian based on subject’s food preferences and habits as reported in the alimentary diary.
|Figure 1: The low protein content of the diet is - as highlighted in the annotations to this graphical illustration of the macronutrient composition of the test diets - problematic, to say the least.|
"Both the active (one dose treatment arm) and the placebo products were taken as follows: ‘dilute the content of one sachet in a large glass of cool water (200 ml). Shake or stir with a spoon. Consume within 10 30 min before the main meal’. In the case of two-dose treatment arm, one sachet of the active product was taken 30 min before lunch and one sachet 30 min before dinner" (Nobile. 2016).To be able to tell what could be responsible for advantages or disadvantages of the two treatments, the scientists assessed more than just body weight, fat mass (DXA scans), and safety of use as well as the secondary efficacy endpoints, extracellular water, and the circumference of waist, hips, and thighs. They also checked the CCK and GLP-1 levels in their subjects' blood. This is relevant, because this is how the fish hydrolysate is advertised on the manufacturers website:
"Taken daily before meals, Slimpro® increases the production of CCK and GLP-1 in the body, thus amplifying messages associated with a decrease of food intake. Promising results were reported from in vivo et in vitro trials of these molecules that may control food intake. Scientists have described this ingredient as a direct action on the hunger process" (Nobile. 2015).As it is usually the case in studies like this, some patients were "lost". In this case, we're talking about a total count of eleven subjects who did not reappear for the follow-up check (One subject in the one-dose treatment arm, four subjects in the twodose treatment arm, and six subjects in the placebo treatment arm discontinued intervention because they were no longer interested to participate in the study). The results of the other subjects are plotted in Figure 2:
|Figure 2: Changes in body composition after 45 and 90 days of dieting w/ the specific supplements (Nobile. 2016).|
- Duarte, Jairo, et al. "Immunomodulating capacity of commercial fish protein hydrolysate for diet supplementation." Immunobiology 211.5 (2006): 341-350.
- Hatanaka, Akimasa, et al. "Isolation and identification of antihypertensive peptides from antarctic krill tail meat hydrolysate." Journal of food science 74.4 (2009): H116-H120.
- Kim, Se-Kwon, Dai-Hung Ngo, and Thanh-Sang Vo. "Marine fish-derived bioactive peptides as potential antihypertensive agents." Adv Food Nutr Res 65 (2012): 249-260.
- Li, Ying, et al. "Purification of a novel angiotensin I-converting enzyme (ACE) inhibitory peptide with an antihypertensive effect from loach (Misgurnus anguillicaudatus)." Journal of agricultural and food chemistry 60.5 (2012): 1320-1325.
- Marchbank, T., et al. "Clinical trial: protective effect of a commercial fish protein hydrolysate against indomethacin (NSAID)‐induced small intestinal injury." Alimentary pharmacology & therapeutics 28.6 (2008): 799-804.
- Möller, Niels Peter, et al. "Bioactive peptides and proteins from foods: indication for health effects." European journal of nutrition 47.4 (2008): 171-182.
- Nazeer, R. A., NS Sampath Kumar, and R. Jai Ganesh. "In vitro and in vivo studies on the antioxidant activity of fish peptide isolated from the croaker (Otolithes ruber) muscle protein hydrolysate." Peptides 35.2 (2012): 261-268.
- Najafian, L., and Abd Salam Babji. "A review of fish-derived antioxidant and antimicrobial peptides: their production, assessment, and applications." Peptides 33.1 (2012): 178-185.
- Ngo, Dai-Hung, et al. "Free radical scavenging and angiotensin-I converting enzyme inhibitory peptides from Pacific cod (Gadus macrocephalus) skin gelatin." International journal of biological macromolecules 49.5 (2011): 1110-1116.