Weight Loss
Conditions
Brief summary
Although individuals following commercial intermittent fasting programmes consume meal replacement products during fasting days, further behavioural variables such as time of food consumption, sleep quality and duration, appetite and mood may significantly impact weight loss and intervention success. This project aims to assess behavioural patterns (dietary intake, sleep, meal timing, physical activity), mood and appetite on both fasting and non-fasting days and to investigate whether these are associated with weight loss.
Interventions
DIETARY_SUPPLEMENTIntermittent fasting
Three fasting days a week, whereby participants consume 600-800 kcal/day from 4 meal replacement products: breakfast, lunch, a snack and dinner. During the other 4 non-fasting smart days each week, participants are instructed to consume 2 x 300 kcal meals and 2 x 100 kcal snacks, from a selection of recipes, plus one meal of their own choosing.
Sponsors
LighterLife (UK) Ltd
King's College London
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Those responding to adverts on the LighterLife Fast Challenge social media channels will be asked if they would like to participate
Exclusion criteria
* Those without access to a smart phone or laptop will not be eligible to take part in the study due to the need to report variables daily
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Body weight in kg | Change in body weight up to 12 weeks | Weighed at home |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Would you like to eat something fatty? | Daily from day 1 up to 12 weeks | Visual Analogue Scales, scale of 0 (yes very much) -100 (not at all) |
| Sleep duration | Before weight loss programme (day 0) | Pittsburg Sleep Quality Index (PSQI) questionnaire |
| Sleep quality | Before weight loss programme (day 0) | Pittsburg Sleep Quality Index (PSQI) questionnaire |
| Physical activity | Before weight loss programme (day 0) | Simple Physical Activity Questionnaire (SIMPAQ) |
| Meal timings | Before weight loss programme (day 0) | Meal timings questionnaire |
| How hungry do you feel? | Daily from day 1 up to 12 weeks | Visual Analogue Scales, scale of 0 (I am not hungry at all) -100 (I have never been more hungry) |
| How satisfied do you feel? | Daily from day 1 up to 12 weeks | Visual Analogue Scales, scale of 0 (I am completely empty) -100 (I cannot eat another bite) |
| How full do you feel? | Daily from day 1 up to 12 weeks | Visual Analogue Scales, scale of 0 (not at all) -100 (totally full) |
| How much do you think you can eat? | Daily from day 1 up to 12 weeks | Visual Analogue Scales, scale of 0 (nothing at all) -100 (a lot) |
| Would you like to eat something sweet? | Daily from day 1 up to 12 weeks | Visual Analogue Scales, scale of 0 (yes very much) -100 (not at all) |
| Would you like to eat something salty? | Daily from day 1 up to 12 weeks | Visual Analogue Scales, scale of 0 (yes very much) -100 (not at all) |
| Would you like to eat something savoury? | Daily from day 1 up to 12 weeks | Visual Analogue Scales, scale of 0 (yes very much) -100 (not at all) |
| Mindfulness - I was finding to difficult to stay focused on what I was doing | Weekly from week 1 up to 12 weeks | Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much) |
| Mindfulness - I was doing something without paying attention | Weekly from week 1 up to 12 weeks | Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much) |
| Mindfulness - I was preoccupied with the future or the past | Weekly from week 1 up to 12 weeks | Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much) |
| Mindfulness - I was doing something automatically without being aware of what I was doing | Weekly from week 1 up to 12 weeks | Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much) |
| Mindfulness - I was rushing through something without really being attentive to it. | Weekly from week 1 up to 12 weeks | Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much) |
| Height | Before weight loss programme (day 0) | Height in cm |
| Dietary intake (macronutrients and energy) | Before weight loss programme (day 0) | 24 h recall x 2 |
| Diet quality | Before weight loss programme (day 0) | 24 h recall x 2 |
| Meal replacement product choice | Fasting days: Weeks 1, 2, 3, 4, 8 and 12 | Question: Which meal replacement products did you consume? |
| Meal replacement product timings | Fasting days: Weeks 1, 2, 3, 4, 8 and 12 | Question: What time did you consume the meal replacement products? |
| Alcohol use | Before weight loss programme (day 0) | AUDIT questionnaire |
| Overall my mood is (very unpleasant to very pleasant) | Daily from day 1 up to 12 weeks | Brief Mood Introspection Scale (BMIS), scale -10 to 10 |
Countries
United Kingdom
Outcome results
None listed