Programmes also contribute to improving household livelihoods and food availability by, for example, allowing investments in new productive assets, improving agricultural assets such as land and enhancing access to inputs or markets or credit. Programmes also contribute to improving human capital by enhancing health and education outcomes, and nutrition outcomes have been improved by social protection programmes in many countries, the most notable impacts being large reductions in stunting and wasting, and significant increases in height-for-age expected at adulthood. There are a number of reasons for this.