The Best Way to Lose Weight

Recently I've re-started exercising regularly to return to a healthier weight.  I've found that the best motivational tool to avoid eating or snacking too much is to weigh myself every day.  Eating that muffin or chowing down on free food at a seminar is suddenly much less appealing when I wonder how much  it would set me back in terms of re-gaining weight I'd worked hard to lose. Is that extra slice really worth wasting the week's effort I spent to lose x kg?