Overweight and Obesity
Conditions
Keywords
Obesity, Overweight, Weight loss, Fasting
Brief summary
The aim of the study is to determine if time-restricted feeding (TRF) is an effective dietary strategy to weight loss after 8 weeks intervention. TRF will be compared with an intervention without restriction in time for feeding. Both strategies will be with caloric restriction.
Detailed description
The participants of the study will be divided in two groups: (1) a group with caloric restriction and without restriction in time for feeding and (2) a group with caloric restriction and restriction in time for feeding. This second group will be subdivided according to the participant's preference: (2.1) first meal at 8 a.m. and last meal at 4 p.m. or (2.2) first meal at 12 p.m. and last meal at 8 p.m. The caloric restriction for all participants will be 513 to 770 kcal from estimated energy requirement.
Interventions
BEHAVIORALCaloric restriction only
Participants in this group will receive a eating plan with caloric restriction (513 to 770 kcal from estimated energy requirements), without restriction in time for feeding, for 8 weeks.
BEHAVIORALCaloric restriction plus TRF morning
Participants in this group will receive a eating plan with caloric restriction (513 to 770 kcal from estimated energy requirements) and 8 hours for eating (from 12 p.m. to 8 p.m.) and 16 hours of fasting, for 8 weeks.
BEHAVIORALCaloric restriction plus TRF night
Participants in this group will receive a eating plan with caloric restriction (513 to 770 kcal from estimated energy requirements) and 8 hours for eating (from 8 a.m. to 4 p.m.) and 16 hours of fasting, for 8 weeks.
Sponsors
Federal University of Minas Gerais
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
FEMALE
Age
18 Years to 59 Years
Healthy volunteers
Yes
Inclusion criteria
* Females; * Aged between 18 and 59 years old; * Body mass index equal or greater 25 kg/m²; * Agree to sign the informed consent.
Exclusion criteria
* Any chronic health conditions (e.g. chronic renal failure, autoimmune, heart, and liver disease); * Thyroid diseases or medications for its treatment; * Medications known to affect total energy expenditure; * Use of steroids, immunosuppressants or non-steroidal anti-inflammatory drugs, weight-loss medications, oral hypoglycemic agents or insulin and any medications that influence metabolic and/or inflammatory parameters; * Previous surgery for weight loss; * Pregnancy or breast-feeding; * Smoking; * Alcohol use (\>2 doses/day).
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in body weight | Baseline and weeks 2, 4 and 8 | Body weight will be assessed by mechanical scale |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change in self-reported energy intake | Baseline and weeks 2, 4 and 8 | Dietary energy intake will be assessed with 3-days food records |
| Change in self-reported intervention adherence | Baseline and weeks 2, 4 and 8 | Adherence will be assessed by daily record of feeding hours |
| Change in metabolic profile | Baseline and weeks 2, 4 and 8 | Fasting lipids, glucose and free fatty acids |
| Change in self-reported stress | Baseline and weeks 2, 4 and 8 | Self-reported stress will be assessed by a questionnaire (Perceived Stress Scale). The total of the scale is a sum of scores of 14 questions. Total score can range from zero to 56. The higher the score, the higher the level of stress. |
| Change in self-reported anxiety | Baseline and weeks 2, 4 and 8 | Self-reported anxiety will be assessed by a questionnaire (Beck Anxiety Inventory). The questionnaire consists of 21 items and the severity of each of them scored from 0 to 3. The degree of anxiety will be classified according to the final score obtained: 0-7 absent or minimum; 8-15 light; 16-25 moderate; 26-63 severe. |
| Change in self-reported depression | Baseline and weeks 2, 4 and 8 | Self-reported depression will be assessed by a questionnaire (Beck Depression Inventory). The questionnaire consists of 21 items and the severity of each one scored from 0 to 3. The volunteers will be classified according to the score obtained: BDI ≤ 15: without depression; 16 ≤ BDI ≤ 20: dysphoria; BDI\> 20: depression. |
| Change in body composition | Baseline and weeks 2, 4 and 8 | Body composition will be assessed by electrical bioimpedance |
| Change in resting energy expenditure | Baseline and weeks 2, 4 and 8 | Resting energy expenditure will be assessed by indirect calorimetry |
| Change in self-reported diet composition | Baseline and weeks 2, 4 and 8 | Dietary macronutrient intake will be assessed with 3-days food records |
Other
| Measure | Time frame | Description |
|---|---|---|
| Leptin | Baseline and weeks 2, 4 and 8 | Change will be assessed in blood sample |
| Ghrelin | Baseline and weeks 2, 4 and 8 | Change will be assessed in blood sample |
| Brain-Derived Neurotrophic Factor (BDNF) | Baseline and weeks 2, 4 and 8 | Change will be assessed in blood sample |
| High-sensitivity C-reactive protein | Baseline and weeks 2, 4 and 8 | Change will be assessed in blood sample |
| Insulin | Baseline and weeks 2, 4 and 8 | Change will be assessed in blood sample |
Countries
Brazil
Contacts
Primary ContactAdaliene VM Ferreira, PhD
Outcome results
None listed