Fortunately for her, there are many crisp-weather foods to enjoy once the leaves turn-and each one blasts fat with the perfect combination of fibre, protein and heart-healthy nutrients. These RD-approved picks will help you lose weight fast this fall season.

1. Green Tea

"Just as the cool weather is coming, if you can drink 4-5 cups a day you may actually not only warm up but speed up your metabolism and even burn more calories (and fat, including belly fat!) in your sleep, thanks to its polyphenol called epigallocatechin-3-gallate, or EGCG," explain The Nutrition Twins, Lyssie Lakatos, RDN, and Tammy Lakatos Shames, RDN, and authors of The Nutrition Twins' Veggie Cure. "It also contains the amino acid theanine that brings on a mental alertness and calmness that helps you to make rational decisions, so you can turn down fatty, caloric foods that you'd normally eat due to stress."

Summer may be all about those fresh fruits, but autumn is a great time to incorporate dried fruits into your diet. "Dried plums are one of the best natural constipation remedies. A serving of four to five dried plums packs three full grams of fibre," shares Rebecca Scritchfield, RDN, author of the upcoming book, Body Kindness. "About half of that is insoluble, which helps speed food through the digestive tract. The other half is slow-moving soluble fibre good for enhancing satiety, lowering cholesterol and regulating blood-sugar levels. They both add up to a very healthy gut."

3. Kiwi

"They may be small, but these sweet-tasting fruits contain a hefty amount of actinidin, a natural enzyme unique to kiwifruit that aids in digestion by breaking down protein in the body. Kiwifruit also contains prebiotic fibre, which primes the gut for healthy digestion," says Scritchfield. "Research indicates that a daily serving of green kiwifruit helps increase bowel movements."