Wellness tracking platform MyFitnessPal raised $18 million in the first round of funding led by Kleiner Perkins Caufield & Byers. Accel Partners also participated. Kleiner Perkins' John Doerr and Accel Partners' Andrew Braccia also joined MyFitnessPal's board.

MyFitnessPal will use the funding to grow its team and expand to more countries. Already, the fitness system is available in some European and South American countries. Users can download the app in French, German, Spanish, and Brazilian Portuguese.

MyFitnessPal offers users a way to track fitness and diet trends. The system is available as an app on iOS and Android devices and offers support and coaching from experts as well as other users. MyFitnessPal has partnered with companies such as Fitbit, Withings, iHealth and Jawbone in order to sync wearable devices and apps to its program. Other app partnerships include Endomondo Sports Tracker, EveryMove, RunKeeper, Runtastic, Rhythm Pulse Monitor, Striiv Smart Play Pedometer and Digifit.

According to the company, MyFitnessPal has seen an increase of more than 1.5 million new users per month, and since its launch in September 2005, has amassed more than 40 million users.

Earlier this year, Consumer Reports listed MyFitnessPal as the best do-it-yourself diet plan, besting diet plans like the Paleo Diet and the Mediterranean Diet. The survey led NBC's The Today Show's blog to declare MyFitnessPal a top app.

In March, MyFitnessPal's deal with developer of software for fitness equipment NetPulse and makers of Matrix Fitness equipment Johnson Technology brought MyFitnessPal's system to the gym. The partnership aimed to allow data sharing to be two-way, so that users could both import data from their workouts into the application, and view the MyFitnessPal application while working out on machines.

Kleiner Perkins is no stranger to the mobile health space. Last year, Kleiner Perkins invested $12 million in emotion sensor company Affectiva, which spun out of MIT's Media Lab. A few weeks later, Kleiner Perkins led an investment round with Rock Health that allowed the accelerator to up the amount of seed funding for the participating startups in that year's program from $20,000 to $100,000.