Meal Timings, Appetite, Mood and Weight Loss in Individuals on a Commercial Intermittent Fasting Programme

King's College London33 enrolled

Overview

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.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Weight Loss

Interventions

Intermittent fastingDIETARY_SUPPLEMENT

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.

Eligibility

Sex: ALLMin age: 18 YearsHealthy volunteers:

Medical Language ↔ Plain English

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

Locations (1)

Department of Nutritional Sciences, King's College London

London, United Kingdom

Outcomes

Primary Outcomes

Body weight in kg

Weighed at home

Time frame: Change in body weight up to 12 weeks

Secondary Outcomes

Sleep duration

Pittsburg Sleep Quality Index (PSQI) questionnaire

Time frame: Before weight loss programme (day 0)

Sleep quality

Pittsburg Sleep Quality Index (PSQI) questionnaire

Time frame: Before weight loss programme (day 0)

Physical activity

Simple Physical Activity Questionnaire (SIMPAQ)

Time frame: Before weight loss programme (day 0)

Meal timings

Meal timings questionnaire

Time frame: Before weight loss programme (day 0)

How hungry do you feel?

Visual Analogue Scales, scale of 0 (I am not hungry at all) -100 (I have never been more hungry)

Time frame: Daily from day 1 up to 12 weeks

How satisfied do you feel?

Visual Analogue Scales, scale of 0 (I am completely empty) -100 (I cannot eat another bite)

Time frame: Daily from day 1 up to 12 weeks

How full do you feel?

Visual Analogue Scales, scale of 0 (not at all) -100 (totally full)

Time frame: Daily from day 1 up to 12 weeks

How much do you think you can eat?

Data from ClinicalTrials.gov

This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.

Visual Analogue Scales, scale of 0 (nothing at all) -100 (a lot)

Time frame: Daily from day 1 up to 12 weeks

Would you like to eat something sweet?

Visual Analogue Scales, scale of 0 (yes very much) -100 (not at all)

Time frame: Daily from day 1 up to 12 weeks

Would you like to eat something salty?

Visual Analogue Scales, scale of 0 (yes very much) -100 (not at all)

Time frame: Daily from day 1 up to 12 weeks

Would you like to eat something savoury?

Visual Analogue Scales, scale of 0 (yes very much) -100 (not at all)

Time frame: Daily from day 1 up to 12 weeks

Would you like to eat something fatty?

Visual Analogue Scales, scale of 0 (yes very much) -100 (not at all)

Time frame: Daily from day 1 up to 12 weeks

Overall my mood is (very unpleasant to very pleasant)

Brief Mood Introspection Scale (BMIS), scale -10 to 10

Time frame: Daily from day 1 up to 12 weeks

Mindfulness - I was finding to difficult to stay focused on what I was doing

Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much)

Time frame: Weekly from week 1 up to 12 weeks

Mindfulness - I was doing something without paying attention

Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much)

Time frame: Weekly from week 1 up to 12 weeks

Mindfulness - I was preoccupied with the future or the past

Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much)

Time frame: Weekly from week 1 up to 12 weeks

Mindfulness - I was doing something automatically without being aware of what I was doing

Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much)

Time frame: Weekly from week 1 up to 12 weeks

Mindfulness - I was rushing through something without really being attentive to it.

Mindful Attention Awareness Scale (MASS), scale 0 (not at all) to 6 (very much)

Time frame: Weekly from week 1 up to 12 weeks

Height

Height in cm

Time frame: Before weight loss programme (day 0)

Dietary intake (macronutrients and energy)

24 h recall x 2

Time frame: Before weight loss programme (day 0)

Diet quality

24 h recall x 2

Time frame: Before weight loss programme (day 0)

Dietary intake (macronutrients and energy)

24 h recall x 4 (4 non-fasting days)

Time frame: Non-fasting days: Weeks 1, 2, 3, 4, 8 and 12

Diet quality

24 h recall x 4 (4 non-fasting days)

Time frame: Non-fasting days: Weeks 1, 2, 3, 4, 8 and 12

Meal replacement product choice

Question: Which meal replacement products did you consume?

Time frame: Fasting days: Weeks 1, 2, 3, 4, 8 and 12

Meal replacement product timings

Question: What time did you consume the meal replacement products?

Time frame: Fasting days: Weeks 1, 2, 3, 4, 8 and 12

Sleep duration

Question: How long did you sleep?

Time frame: Daily from day 1 up to 12 weeks

Sleep quality

Questions to rate quality of sleep

Time frame: Daily from day 1 up to 12 weeks

Physical activity

Question: Did you do any structured exercise today?

Time frame: Daily from day 1 up to 12 weeks

Alcohol use

AUDIT questionnaire

Time frame: Before weight loss programme (day 0)