A wave of Silicon Valley-style disruption is hitting the food industry. Lab-grown meat, vegan cheese and "animal free" milk and eggs are headed for consumers, often with backing from the tech sector and its financial allies.These products could fill an important need while reducing environmental problems, such as energy and land use, for traditional food industries, according to backers. This new group of startups is essentially hacking the food sector with new ideas and technologies about food and with strong ties to Silicon Valley. Some are using plant proteins to substitute for animal products, while others are producing foods biologically through so-called "cellular agriculture" - the use of stem or other cells to produce replications of animal products.

At least $138 million in investment has been poured into the segment of "sustainable protein" startups in 2014, according to the research firm AgFunder. Another research firm, CB Insights, calculated that at least $221 million has been invested in the sector over the past 18 months. More deals appear to be cooking, with participation from major Silicon Valley players like Google Ventures and equity firm Andreessen Horowitz.

"I think this new industry will be disruptive," said Isha Datar, executive director of the nonprofit group New Harvest, which promotes cellular agriculture.

The tech sector is spearheading this effort, Datar said, with most of the traditional food industry stuck in "a deeply ingrained system that makes it less amenable to change." Brooklyn-based startup Modern Meadow is developing an edible, cultured meat prototype along with bioengineered leather products, which do not require animals to be slaughtered. The company has funding from tech venture firms Sequoia Capital and Artis Ventures. "This is biofabrication, where cells themselves can be used to grow biological products like tissues and organs," said Modern Meadow CEO Andras Forgacs at a recent TED conference. "Perhaps biofabrication is a natural evolution of manufacturing for mankind. It's environmentally responsible, efficient and humane."

In 2013, Mark Post, a professor of tissue engineering at the Netherlands-based Maastricht University presented the first lab-grown hamburger. The product, backed by Google co-founder Sergey Brin, was derided as a "Frankenburger" but nonetheless sparked interest in lab-produced foods.

San Francisco-based Clara Foods is using a similar in-vitro technique to produce "animal free" egg whites, while lab-produced milk is on its way in the same city from a startup called Muufri. "These products are just as versatile as the real ones," said Gilonne d'Origny of New Harvest. "An egg white [produced through cellular agriculture] can be used to make meringue ... If you create a flank steak this way, its cells will be lined up the same way as a real flank steak; so, it will be identical." Among the prominent investors in this sector is Microsoft founder Bill Gates, who sees the industry as helping fight against a key environmental challenge.

"How can we make enough meat without destroying the planet?" Gates said on his blog. He added that he is "hopeful about the future of meat substitutes. I have invested in some companies working on this and am impressed with the results so far."

Gates is among the backers of Hampton Creek Foods, a San Francisco startup that makes plant-based egg substitutes for mayonnaise and cookie dough, and Impossible Foods, which produces vegetable-based meat and cheese substitutes.

While meat substitutes have been around for years, today's startups are aiming to use technology and innovation that have worked in Silicon Valley. Yet, it remains unclear if the general public will accept these manufactured food substitutes.