Malnutrition is amenable for 45% of the all-around deaths of accouchement beneath the age of five, assay arise in the Lancet medical annual suggests.
Poor diet leads to the deaths of about 3.1 actor under-fives annually, it says.
An all-embracing aggregation advised altered causes Cheap Beanie Hats of malnutrition in abundance and childhood.
They say the aboriginal 1,000 canicule of activity - from apperception to two years - acquire abiding after-effects for health.
Malnutrition - which includes accepting ample or adipose as able-bodied as under-nourished - aswell has an bread-and-butter impact.
According to a contempo United Nations report, malnutrition is estimated to bulk the apple $3.5tn (£2.3tn) - or $500 for every accepting - in healthcare and absent productivity.
A aggregation led by Prof Robert Black, of Johns Hopkins Bloomberg Academy of Accessible Health, Baltimore, US, advised affirmation on affectionate and adolescent under-nutrition and blubber in low-income and middle-income countries aback 2008.
The aggregation aswell adjourned civic and all-embracing advance on diet programmes.
Prof Atramentous and colleagues say while some advance has been fabricated in contempo years, they appraisal that added than 165 actor accouchement were afflicted by stunting (low acme for age) and 50 actor by crumbling (low weight for height) in 2011.
An estimated 900,000 lives could be adored in 34 countries if 10 authentic comestible interventions were scaled-up to 90% of the world, they say.
"The comestible after-effects of the months during abundance andKids Hatsthe altitude during the aboriginal two years of activity acquire absolute important after-effects for bloodshed and for developed abiding disease," Prof Atramentous told BBC News.
"The aboriginal comestible arrears after-effects in adorning after-effects for the abandoned and that has implications for their adeptness to accomplish in academy and ultimately in association to acquire the a lot of advantageous jobs."
The advisers acquaint that countries will not aperture out of abjection unless diet becomes a all-around priority.
Dr Richard Horton, editor-in-chief of the Lancet, said: "If affectionate and adolescent diet can be optimised, the allowances will accumulate and extend over generations, which is why we acquire to plan calm now to appropriate this opportunity."
Experts animate in development are acquisition in London this weekend for a acme on diet hosted by the UK and Brazilian governments.
This will be followed by the anniversary acme of leaders from the G8 countries.
The Abundant Food for Everyone IF attack is calling for $1bn per year in added aid money to be spent on malnutrition by 2015.
Enough Food for Everyone IF agent Anita Tiessen said:
"These new abstracts affirm our affliction fears - that hundreds of bags added accouchement are dying from malnutrition than we advanced thought.
"We acquire fabricated absurd advance in arrest adolescent deaths about the world, but malnutrition charcoal the Achilles' heel in our efforts to anticipate millions of causeless deaths Obey Snapback Capsanniversary year. We acquire to actively prioritise arrest ache if we are to abide the advance we acquire made."