Research Question:
How do the longterm effects of adopting a lowcarbohydrate diet affect one’s overall health?
Main Claim:
The adoption of a lowcarbohydrate diet is beneficial to one’s overall health. However, like with any diet plan, there are some risks involved. →Sources→
↓Reasons ↓
Reason 1:
Lowcarbohydrate
diets are beneficial to one’s health by improving metabolic health through the improvement of cardiovascular and hormonal components.
Astrup et. al
“Triglyceride concentrations were significantly more reduced.
HDLcholesterol
improved more”
(2004, p.898).
“Improvements
in
LDLcholesterol
particle size and in postprandial bloodlipid profile” (2004,
p.898).
Atallah et. al
“Eight
[shortterm]
RCTs provided data on Atkins and suggest a favorable impact on highdensity lipoprotein cholesterol and triglycerides relative to usual care,
WW, and
Zone” (2014,
822).
“Longterm
RCTs comparing Atkins to usual care showed significant improvements in highdensity
Bravata et. al
Crowe et. al
Mean change
[with SD] in
BMI: 1.4
2
(4.6) kg/m
(2003, p.
1844)
Mean change
[with SD] in
Body fat:
1.0 (5.6)%
(2003, p.
1844)
Mean change
[with SD] in
Total
cholesterol:
1.2 (7.3) mg/dL (2003,
p. 1844)
Mean change
[with SD] in
LDLcholest
erol: 0.3
(9.7) mg/dL
(2003, p.
1844)
“One of the consistent findings reported in the literature is the ability of lowcarbohydr ate diets to significantly lower triglyceride levels” (2005,
p. 237)
“Lowcarbohy
drate diets tend to result in increases in
HDLcholester
ol while the effect on lowdensity (LDL) cholesterol is variable” (2005, p.237)
Ebbeling et. al
“HDLcholestero l… triglycerides… and plasminogen activator inhibitor 1… were most favorable with the very lowcarbohydrat e diet” (2012,
p.2630).
“Leptin was … lowest with the very lowcarbohydrat e diet” (2012, p.
2630).
“The very lowcarbohydrat e diet produced the greatest improvements in most metabolic syndrome lipoprotein cholesterol and, to a lesser extent, triglyceride levels at 12 and 24 months” (2014, p. 822).
“Findings from short term RCTs showed that
Atkins and
WW had favorable effects on SBP and DBP, with benefits being greatest with the Atkins diet” (2014, p.
822)
Mean change
[with SD] in
HDLcholest
erol: 0.2
(2.1) mg/dL
(2003, p.
1844)
Mean change
[with SD] in
Triglycerides
: +4.1 (4.5)
(2003, p.
1844)
Mean change
[with SD] in
Systolic
blood pressure: +0.7 (5.2) mm Hg
(2003, p.
1844)
“Greater improvements in
HDLcholester
ol and triglycerides were observed throughout most of the study on lowcarbohydr ate diets”
(2005, p.237)
“One 6week study involving 20 normal weight and lipidaemic men who switched from their habitual diet to a ketogenic diet… found favourable improvements in fasting triglycerides, … postprandial lipaemia… and fasting serum insulin… with no significant changes in
LDL and
HDLcholester
ol” (2005, p.
238)
components”
(2012, p. 2632).
Blood Pressure in mm Hg
PreWeightLoss
: Systolic 116
(114 to 119)
Diastolic 67 (64 to 70) (2012, p.
2631)
Blood Pressure for Very
Lowcarbohydrat
e diet: Systolic
111 (109 to 114)
Diastolic 63 (61 to 66) (2012, p.
2631)
“Low carbohydrate diets appear to have favourable effects on some blood lipids in the short to medium term while the effect on LDLcholester ol is variable”
(2005, p.239)
“Lowcarbohy
drate dieters typically show increases in
HDLcholester
ol, which is the opposite to that observed on a lowfat diet”
(2005, p. 239)
Reason 2:
Lowcarbohydrate
diets are beneficial to one’s health by decreasing one’s chances of developing certain forms of cancer
Reason