Red meat has been condemned as a cancer-causing, blood pressure-raising no-no.

Indeed, nutritional guidelines in both the UK and the US advise eating no more than 70g of beef, pork, or steak per day.

But a new review of clinical trials from Purdue University has found quite the opposite.

According to the study, eating more than the recommended daily amount of red meat does not affect short-term heart disease risk factors, such as blood pressure and blood cholesterol.

In fact, they found unprocessed red meat to be a good source of nutrients for patients.

A new study has found red meat, such as unprocessed beef and pork, is not dangerous

'During the last 20 years, there have been recommendations to eat less red meat as part of a healthier diet, but our research supports that red meat can be incorporated into a healthier diet,' said Wayne Campbell, professor of nutrition science.

'Red meat is a nutrient-rich food, not only as a source for protein but also bio-available iron.'

The recommendations to limit red meat from the diet come mainly from studies that look at the dietary habits of people with cardiovascular disease.

Although these studies showed these people typically ate red meat, they were not designed to show that red meat caused cardiovascular disease.

To investigate the issue further Professor Campbell, worked with doctoral student Lauren O'Connor, and postdoctoral researcher Jung Eun Kim, to conduct a review and analysis of past clinical trials.

Their aim was to detect cause and effect between eating habits and health risks.

They screened hundreds of related research articles, focusing on studies that met specific criteria including the amount of red meat consumed, evaluation of cardiovascular disease risk factors and study design.

An analysis of the 24 studies that met the criteria is published in the American Journal of Clinical Nutrition.

'We found that consuming more than half a serving per day of red meat, which is equivalent to a 3 ounce serving three times per week, did not worsen blood pressure and blood total cholesterol, HDL, LDL and triglyceride concentrations, which are commonly screened by health-care providers,' O'Connor said.

This research includes all types of red meat, mostly unprocessed beef and pork.

Professor Campbell said more analysis is needed as the evaluation of blood pressure and cholesterol are not the sole determinants for someone to develop heart disease.

The length of time these experiments were done ranged from a few weeks to a few months as opposed to the years or decades that it could take people to develop cardiovascular disease or have a cardiovascular event.

'It is also important to recognize that our findings are specific to selected indicators for cardiovascular disease risk,' Professor Campbell said.