Organic produce may be pricier but it’s worth it. In fact nonorganic apple, berries, lettuce etc can make you gain weight. Many of the pesticides used on our produce can seep their way into our bodies and can wreak havoc on our hormones and genes. This can lead to a slower metabolism, the inability to build and maintain muscle and the increased capacity to build new fat cells, according to Perrine. If going organic all the way is too much on your pocket book, at the very least buy organic versions of what’s been called the Dirty Dozen, the produce that has the highest levels of pesticide: peaches, apples, sweet bell peppers, celery, nectarines, strawberries, cherries, pears, grapes, spinach, lettuce and potatoes.