***TASK*** the task is to summarize an input biomedical literature in six sentences 
    ***INPUT*** the input is a biomedical literature 
    ***OUTPUT*** the output is the summary of an input biomedical literature in six sentences 
    ***DOCUMENTATION*** 
    ***EXAMPLES*** 
    Input: The provision of vitamin A in food sources of beta-carotene is an alternative to the distribution of high-dose capsules . To examine factors that may influence the success of food-based programs , a study was carried out in Sumatra , Indonesia , of the effect of food sources of beta-carotene , extra dietary fat , and  Ascaris lumbricoides infection on serum retinol concentrations in children .  Meals and snacks with various amounts of beta-carotene and fat were fed at midday to children 3 - 6 y of age for 3 wk . Some groups of children were dewormed with the anthelmintic levamisole before the feeding period , whereas others remained infected . Results showed that the incorporation of beta-carotene sources ( mainly in the form of red sweet potatoes ) into the meal significantly increased serum retinol concentrations . The greatest rise in serum retinol occurred when meals contained added beta-carotene sources and added fat and the children were dewormed . Adding more fat to the meal and deworming the children caused a rise in serum retinol similar to that seen when feeding additional beta-carotene sources . Moreover , the effects of fat and deworming together were additive to the effects of additional beta-carotene sources . When the meal contained additional beta-carotene sources , added fat caused a further improvement in serum retinol concentrations but only if A. lumbricoides infection was low . These studies indicated that food-based interventions in vitamin A-deficient areas might be successful and that other interventions such as increasing dietary fat concentrations and anthelmintic treatment should be considered along with increasing consumption of beta-carotene-rich food β-Carotene-rich orange sweet potato ( OSP ) has been shown to improve vitamin A status of infants and young children in controlled efficacy trials and in a small-scale effectiveness study with intensive exposure to project inputs . However , the potential of this important food crop to reduce the risk of vitamin A deficiency in deficient population s will depend on the ability to distribute OSP vines and promote its household production and consumption on a large scale . In rural Mozambique , we conducted a r and omised , controlled effectiveness study of a large-scale intervention to promote household-level OSP production and consumption using integrated agricultural , dem and creation/behaviour change and marketing components . The following two intervention models were compared : a low-intensity ( 1 year ) and a high-intensity ( nearly 3 years ) training model . The primary nutrition outcomes were OSP and vitamin A intakes by children 6 - 35 months and 3 - 5·5 years of age , and women . The intervention result ed in significant net increases in OSP intakes ( model 1 : 46 , 48 and 97 g/d ) and vitamin A intakes ( model 1 : 263 , 254 and 492 μg retinol activity equivalents/d ) among the younger children , older children and women , respectively . OSP accounted for 47 - 60 % of all sweet potato consumed and , among reference children , provided 80 % of total vitamin A intakes . A similar magnitude of impact was observed for both models , suggesting that group-level trainings in nutrition and agriculture could be limited to the first project year without compromising impact . Introduction of OSP to rural , sweet potato-producing communities in Mozambique is an effective way to improve vitamin A intakes 
    Output:
    
Conclusions : Orange-fleshed sweet potatoes are widely accepted by Mozambican farmers and consumers , and various studies show a positive impact on vitamin A status due to the introduction of this nutritionally superior staple crop .