Title Page
ABSTRACT
국문 초록
Contents
Chapter 1. Introduction 13
1.1. Background 13
1.2. Rationale 16
1.3. Objective 20
Chapter 2. Methods 22
2.1. Protocols 22
2.2. Information sources 22
2.3. Eligibility criteria 23
2.4. Search strategy 24
2.5. Selection of sources 25
2.6. Data extraction 26
2.7. Synthesis of results 26
Chapter 3. Results 27
3.1. Selection of sources 27
3.2. Characteristics of sources 29
3.3. Individual results and synthesis of results 32
3.3.1. Research question 1. Is there a significant association between protein intake and the risk of depression? If so, is there a dose-response relationship? 39
3.3.2. Research question 2. Is protein intake from specific sources significantly associated with depression? 42
3.3.3. Research question 3. Is there a significant association between individual amino acid levels and depression? 43
Chapter 4. Discussion 45
Chapter 5. Conclusions 49
REFERENCE 50
Table 1.1. Diagnostic criteria for major depressive disorder 15
Table 2.1. Search terms 25
Table 3.1. Frequency of research nationality, study design, measurements, and results included in this review (N=12) 30
Table 3.2. Tabulated data of studies on depression and protein intake 33
Table 3.3. Confounding factors 40
Figure 1.1. Mechanism of acute tryptophan depletion 18
Figure 3.1. Flow chart of study selection process 28