Best performed during the waning moon. Light a pink candle for self-love; anoint it with the oil of your choice. Next light a brown candle. Engrave the number of pounds you want to lose on it, then visualize banishing the excess weight. Runes can be carved on it if you wish. Incense can be burned; visualize the smoke carrying away the excess poundage. Adapt the spell to your own personal needs.
Source: Old Witchcraft