The range, Kellogg's most significant launch in recent years, will comprise products containing no added sugar or artificial flavours. These will include two cereals, called Kashi Original Seven Grains and Kashi Honey, as well as snack bars and possibly drinks.
The line will be rolled out to health-food stores and supermarkets from May, with sources claiming it will require marketing support of up to £10m if it is to become a power brand alongside Kellogg products such as Special K and Corn Flakes.
Kashi, acquired by Kellogg in 2000, is already a success in the natural foods sector in the US. Since its acquisition, the brand's sales have risen from $20m (£10.6m) to nearly $200m (£106m).
The launch of Kashi in the UK marks a strategic move for Kellogg at a time when FMCG brands are coming under increasing pressure from the anti-obesity lobby.
Last year, Kellogg's All-Bran ran its biggest campaign in four years.
The ads, featuring former Star Trek star William Shatner, focused on the health benefits of the cereal's high fibre content.