Albert Arrieta Aspilcueta

During weight loss the loss of body mass is associated not only with body fat reduction but also with a decrease in fat-free mass (FFM), related to the reduction in muscle mass and function(1). Supplementation with long-chain n-3 fatty acids (LCn-3 PUFA), in the absence of caloric restriction, results in a significant decrease in fat mass and an increase in FFM(2) along with improvements in muscle mass and strength(3). However, the impact of supplementation with LCn-3 PUFA during weight loss) remains unknown. Therefore, the aim of this study was to explore the effects of LCn-3 PUFA supplementation, in the form of Krill oil (KO), during alternate day fasting (ADF) on body weight, fat mass loss, FFM and muscle function changes in healthy overweight and obese adults.

A total of 41 men and women (age: 39.35 ± 10.4 years, BMI: 31.05 ± 4.2 kg/m2) completed the study (NCT06001632), in which they were randomised into either a KO or Placebo (PL) groups. Both groups carried out 8-weeks of ADF combined with intake of 4 g/day of the corresponding supplements. ADF involved consuming no more than 500 calories on the 'fast day’ and consuming food ad libitum on each 'feed day’. Data on body weight and body composition (TBF-300, Tanita, Manchester, UK), handgrip strength (Handheld Hydraulic Dynamometer, Vernier Jamar; England, UK), and time to conduct 5 repetition of chair rising test were obtained pre-and post-intervention. Changes from baseline within groups were assessed using paired samples t-test. Mixed analysis of variance (Mixed-ANOVA) was used to measure 2-way interactions between time and group to identify the differences between groups. All statistical analysis were conducted using IBM Statistical Package for the Social Sciences SPSS 28.0.

In both groups, body mass decreased significantly (KO:-4.7 ± 0.4kg, p<0.001; PL:-4.5 ± 0.4kg, p<0.001), along with a significant reduction in fat mass (KO:-2.4 ± 0.5kg p<0.001; PL:-2.3 ± 0.5kg p<0.001), and FFM (KO:-0.6 ± 0.2kg p<0.001; PL:-0.7 ± 0.2kg, p<0.001), with no differences between groups. In the PL group, there was a reduction in handgrip strength (-0.9 ± 0.7 kg, p<0.001), while there was no change in KO group (-0.2 ± 0.5 kg, p=0.1), with a significant difference between groups (p<0.001). In the KO group there was a significant reduction in time to conduct chair rising test (-1.8 ± 0.9s, p<0.05), with no change in the PL group (-0.3 ± 1.3s, p=0.2), with a significant difference between groups (p<0.001).

Supplementation with LCn-3 PUFA (4 g/day) during 8 weeks of ADF, applied to individuals living with overweigh and obesity, does not facilitate body or fat mass loss and does not diminish the reduction in FFM. However, it attenuated the reduction in muscle function in healthy overweight and obese adults.

Background Despite the increasing presence of chefs in professional football and their influence on nutrition provision, evidence on the specific roles and responsibilities of chefs remains limited. This study aimed to explore the role(s) of chefs and describe the characteristics of catering services within English professional football. Methods Sixty-two chefs (56 males, 6 females) in club supervisory positions within the top four divisions of the English male football pyramid were surveyed during the 2022–2023 season. Results Participants were predominantly male, aged 35–44 years, and employed on full-time permanent contracts. Sixteen participants had the term ‘performance’ in their contracted job title. Participants averaged 24 years of chef work experience, 8 years of football-specific experience, and 45 working hours per week. Twenty-nine participants had responsibility for providing nutrition advice to players, whereas the vast majority used nutritional supplements and produced bespoke nutritional items as part of the catering services provided. Most participants rated their sport nutrition knowledge from ‘good’ to ‘excellent’ although only 18 had undertaken formal sport nutrition training. Fifty-one participants frequently followed a periodised nutrition approach, however 31 lacked defined nutrition targets. Tasks such as travelling to fixtures, hotel menu planning, and hotel food provision were most frequent in the Premier League. Catering services in the Premier League mostly operated year-round, seven days a week, employing 4 or more chefs, and spending £6,000 or more per week, with declining operations, costs, and staffing towards the lower divisions. Forty-nine services covered male academy teams alongside the male senior team. Only 15 covered female senior teams, of which 7 extended coverage to female academy teams. Conclusions Chefs undertake key roles both at and away from the club training ground to implement sport nutrition strategies. Inconsistencies in strategy implementation and catering practices were identified, along with league disparities and gender inequalities in service provision. Our findings underscore the need for a quality-assurance framework for accreditation and increased opportunities for chef-tailored sport nutrition education. We advocate for the title ‘sport chef’, and the establishment of a regulatory body to support the practice of chefs working in professional football.