Subgroup analyses showed that using whole flaxseed in doses ≥30 g d-1 , longer-term interventions ( ≥12 weeks ) and studies including participants with higher BMI ( ≥ 27 kg m-2 ) had positive effects on body composition  .
Whole flaxseed is a good choice for weight management particularly for weight reduction in overweight and obese participants
Flaxseed consumption may be inversely associated with obesity ; however , findings of available r and omized controlled trials ( RCTs ) are conflicting .
The present study aim ed to systematic ally review and analyse RCTs assessing the effects of flaxseed consumption on body weight and body composition .
Dietary substitution with an alpha-linolenic acid-rich vegetable oil increases eicosapentaenoic acid concentrations in tissues.
Thirty healthy male volunteers were r and omly allocated into two dietary treatment groups . The  flaxseed group ( n = 15 ) maintained a diet high in alpha-linolenic acid ( alpha-LA ; 18:3n-3 ) and low in linoleic acid ( LA ; 18:2n-6 ) by using a flaxseed oil and spread that are high in alpha-LA . The  control group ( n = 15 ) maintained a diet high in LA and low in alpha-LA , typifying a Western diet . Both groups maintained their diets for 4 wk , followed by another 4-wk period in which they supplemented the diets with fish oil [ 1.62 g eicosapentaenoic acid ( EPA , 20:5n-3 ) daily and 1.08 g docosahexaenoic acid ( DHA , 22:6n-3 ) daily ] in a triglyceride form . The flaxseed oil-containing diet result ed in significant increases in alpha-LA concentrations in the plasma phospholipid , cholesteryl ester , and triglyceride fractions ( eightfold increase ) and neutrophil phospholipids ( 50 % increase ) . EPA concentrations increased by 2.5-fold in the plasma lipid fractions and neutrophil phospholipids . After fish-oil supplementation  EPA concentrations increased in parallel in both dietary groups , remaining higher in the flaxseed group for both the plasma lipid fractions and neutrophil phospholipids . The results indicate that alpha-LA-rich vegetable oils can be used in a domestic setting ( in conjunction with a background diet low in LA ) to elevate EPA in tissues to concentrations comparable with those associated with fish-oil supplementation
Subgroup analyses showed that using whole flaxseed in doses ≥30 g d-1 , longer-term interventions ( ≥12 weeks ) and studies including participants with higher BMI ( ≥ 27 kg m-2 ) had positive effects on body composition  .
Whole flaxseed is a good choice for weight management particularly for weight reduction in overweight and obese participants
Flaxseed consumption may be inversely associated with obesity ; however , findings of available r and omized controlled trials ( RCTs ) are conflicting .
The present study aim ed to systematic ally review and analyse RCTs assessing the effects of flaxseed consumption on body weight and body composition .