Two young models are heading to Downing Street to lobby for a law to force agencies to take responsibility for the health of their models.

Rosie Nelson and Hayley Hasselhoff, the daughter of Baywatch actor David Hasselhoff, will deliver a petition signed by more than 113,000 people who want to see young people protected from being pressurised into becoming dangerously thin to meet industry requirements.

An inquiry is being held by the All-Party Parliamentary Group (APPG) on body image, chaired by MP Caroline Nokes, which will hear evidence from models and industry experts.

The campaign was developed by Ms Nelson, 23, who was told by a modelling agency that she had "potential" but needed to lose weight.

When she did, the agency told her she needed to lose even more, until she was "down to the bone".

Speaking to ITV's Lorraine show, the Australian-born model said: "She (the agent) pressed on her hips as if to say that my bones should be sticking out, and I didn't think that was an okay thing to be saying to me, and I would hate for another girl to hear those words, take it in a bad way and form body issues.

"Healthiness in the industry is not being targeted; girls are not being taught about health, they are just being told to lose weight."

She also described how she had been on photo shoots of up to 10 hours long with no food provided, and that it is common practice.

The inquiry comes a day after an unknown person was seen handing out "fat hating" cards to overweight people on London's Tube causing outrage on social media.

With the word "fat" written in bold on one side, the cards read: "Our organisation hates and resents fat people. We object to the enormous amount of food resources you consume while half the world starves.

"We disapprove of your wasting NHS money to treat your selfish greed. And we do not understand why you fail to grasp that by eating less you will be better off, slimmer, happy and find a partner who is not a perverted chubby-lover, or even find a partner at all.

"We also object that the beautiful pig is used as an insult. You are not a pig. You are a fat, ugly human."

The cards were signed by "Overweight Haters Ltd" and were reported to the police.

Kara Florish, who was handed one of the cards, tweeted: "Was handed this card on the underground. Is hateful + cowardly + could potentially upset people struggling with confidence."

Onlooker Sean Thomas Knox tweeted: "Young man just got on train at Oxford Circus, gave printed card saying YOU'RE FAT to overweight girl. He jumped off. She read it, & cried."

American plus-size model Ms Hasselhoff told Lorraine that beauty is not about thinness, and that the importance of health needs to be encouraged by families and schools, as well as being safeguarded by the modelling industry.

She told Lorraine: "No one should need to go to unhealthy lengths to follow their dream, in any industry.

"It starts with the family, and schools should be encouraging people to be healthy but also encouraging them to say it's okay to be different sizes and different shapes, and that beauty comes in all different sizes."

As the investigation into the "fat cards" continues. British Transport Police is asking anyone who has been handed one to contact police on 0800 40 50 40 or text 61016.