Gwyneth Paltrow has vowed to live on just $29 worth of food for a week, after agreeing to take on a charity challenge aimed at raising awareness and funds for New York's food banks. 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 brown rice and some black beans. 'This is what $29 gets you at the grocery store - what families on SNAP (i.e. food stamps) have to live on for a week,' she wrote alongside the image. Food-focused: Actress-turned-lifestyle guru Gwyneth Paltrow will be living off $29 worth of food for a week as part of a charity challenge aimed at raising awareness about food banks . Alexander Wang Satin Blazer . Shop the brand at Net-A-Porter . Visit site . A good blazer is an essential item that every girl should have in her wardrobe. But add a touch of satin to it like Gwyneth Paltrow in her Alexander Wang version, and it goes from drab to deluxe in the blink of an eye. The Goop creator made hers a monochrome look by teaming the blush jacket with a flesh toned sweater dress underneath. The silken topper is great for an evening out and can be paired with cigarette trousers and strappy sandals for an elegant take on the menswear trend. Gwyneth's threads are from a few seasons back, so it's no longer available in stores. But our style edit is filled with lustrous alternatives from Missguided to Forever 21. There's even a designer rendition with a snakeskin lapel for those so inclined to spend a little more. Topshop 'Jenny' Satin Peplum Blazer at Nordstrom . Visit site . Forever 21 Metallic Satin Blazer . Visit site . Missguided Satin Lapel Longline Tuxedo Blazer (now $30) Visit site . Stella McCartney Rhea satin blazer at The Outnet (now $784) Visit site . Unsurprisingly, although the grocery store no doubt offered a wealth of cheaper, yet more unhealthy, food options, lifestyle guru Gwyneth opted to stick to what she knows best, choosing only the healthiest and greenest of ingredients for the challenge. It looks as though Gwyneth might be going for a Mexican theme on at least one of the days of the challenge, including gluten-free tortillas, black beans, and avocado in her food haul - all the makings of a very healthy Mexican-inspired feast. In a second tweet posted yesterday, she said of the challenge: 'We're walking in their shoes to see how far we get.' She then proceeded to nominate popular American chef Roy Choi, tagging him  by his Twitter username @RidingShotgunLA. Gwyneth also encouraged her fans to head over to the Food Bank NYC website, take up the challenge themselves, and donate to the cause. There are those, however, who are already criticizing Gwyneth's attempt to experience what living on food stamps is really like; although the actress has vowed to live on just $29 for the week, many suggest that her bizarrely healthy food choices demonstrate just how out of touch she is with the average person. Weekly haul: The 42-year-old actress posted this image of her grocery shop, which included a variety of incredibly healthy food items . Challenge: Gwyneth took to Twitter to share the news about her charity challenge . Writer Rebecca Vipond Brink from The Frisky, highlighted the incredible lack of calories contained in Gwyneth's food choices, suggesting that those people living on SNAP benefits would require a lot more sustenance in order to go about their day-to-day lives. 'I know other people are critiquing this already, but this bothers me on a basic level because eight of those 16 items are not calorically significant (sic),' Rebecca wrote. 'Nutritionally speaking, this is a vitamin bonanza. 'But people who live on SNAP benefits don’t just have to get nutrients, they have to get actual calories, because they tend to have very physical lives, doing service labor and taking care of children and not necessarily being able to afford a car and so forth.' According to The Frisky, the food in Gwyneth's Twitter post contains a total of 7,059 calories, which means the star will be consuming a paltry 1,000 calories per day for the duration of her week-long challenge. That is approximately half of the recommended daily intake for adults suggested by the American Heart Association. Friends together: Gwyneth was nominated to take on the week-long challenge by celebrity chef Mario Batali (pictured together in April 2013) Family ties: It is not known whether Gwyneth's children with ex-husband Chris Martin - Apple, ten, and Moses, nine (pictured) - will be taking part in the challenge with their mother . Many people have also queried why Gwyneth might require a total of seven limes - one per day - for the challenge, suggesting that the money spent on the seemingly pointless fruits would have been better spent on some potatoes, or other filling carbohydrate options. For example, Safeway - where Gwyneth appears to have completed at least part of her shopping - currently sells individual limes for 60 cents each, which adds up to $4.20 for seven. Had Gwyneth chosen a more substantial menu item, she could have picked up four 16 ounce bags of pasta - which retail for $1 - for less than the price of her limes. Gwyneth's decision to take on the $29-per-week challenge comes less than a month after she told CNN Money that she considers herself to be 'incredibly close to the common woman'. 'I'm incredibly close to the common woman in that I'm a woman and I'm a mother and we all are in a physical body with beating hearts with compassion and love we are all seekers,' she said in an interview. 'We all want fulfillment, we all want to live our best lives. We want to be healthy and happy and squeeze the most we can out of life. I think that's all women.' Gwyneth was initially dared to take on the challenge by her close friend, celebrity chef Mario Batali, who is a member of the Food Bank for New York City board, and also challenged singers Sting and Blondie to take part in the week-long trial. According to the Food Bank NYC website, the challenge is aimed at raising public awareness about the plight of the hungry, while also enabling each participant to understand more about the daily struggle those living on food stamps face. 'Congress cut food stamps twice since 2013, and soup kitchens and food pantries saw an immediate increase in visitors,' the food bank's fundraising page explains. 'New Yorkers can't afford any cuts to Food Stamps…The #FoodBankNYCChallenge raises hunger awareness and deepens your understanding about the struggle to afford food on a food stamp budget.' It is not known whether Gywneth's two children with ex-husband Chris Martin, Apple, ten, and Moses, nine, will also be taking part in the challenge however, given the limited supply of food featured in her Twitter picture, it is thought the Shakespeare in Love star is going it alone this time around.
The 42-year-old mother-of-two tweeted a picture of her $29 grocery shop, which included eggs, vegetables, brown rice and black beans .
Gwyneth is taking part in the New York City Food Bank Challenge, which aims to raise awareness and funds for the city's food banks .
The city's weekly food stamp allowance is just $29 per person per week .
Gwyneth's healthy food choices have already come under fire from critics who claim they contain nowhere near enough calories for a whole week .