A study published in the journal Obesity shows that people who eat nuts at least twice a week are much less likely to gain weight than those who almost never eat nuts. I guess in the case of a diet change that this may result in a weight reduction although there is no evidence for this.
The 28-month study involving 8,865 adult men and women in Spain, found that people who ate nuts at least two times per week were 31% less likely to gain weight than were participants who never or almost never ate nuts.
Study authors concluded, "Frequent nut consumption was associated with a reduced risk of weight gain (10 lbs or more).
If eating nuts in the form of peanut butter, be sure to read the label. Hydrogenated(trans-) fats and Sugar are often added to peanut butter.