gwyneth paltrow has vowed to live on just $ 29 worth of food for a week .
the 42-year-old mother-of-two , who founded popular lifestyle wesbite goop , posted a picture of her $ 29 grocery shop on her twitter account yesterday afternoon , showcasing a range of healthy options , including a variety of fresh vegetables , some black beans .
` this is what $ 29 gets you at the grocery store - what families on snap -lrb- i.e. food stamps -rrb- have to live on for a week , ' she wrote alongside the image that